False negative reactions. Medical search

Negative test results in subjects who possess the attribute for which the test is conducted. The labeling of diseased persons as healthy when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)

Techniques used in studying bacteria.

Studies determining the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies. For drugs and devices, CLINICAL TRIALS AS TOPIC; DRUG EVALUATION; and DRUG EVALUATION, PRECLINICAL are available.

Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)

Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)

Incorrect diagnoses after clinical examination or technical diagnostic procedures.

The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.

Thinly cut sections of frozen tissue specimens prepared with a cryostat or freezing microtome.

In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.

A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.

Process of preserving a dead body to protect it from decay.

Lists of words, usually in alphabetical order, giving information about form, pronunciation, etymology, grammar, and meaning.

Analog or digital communications device in which the user has a wireless connection from a telephone to a nearby transmitter. It is termed cellular because the service area is divided into multiple "cells." As the user moves from one cell area to another, the call is transferred to the local transmitter.

Tumors or cancer of the THYROID GLAND.

An adenocarcinoma of the thyroid gland, in which the cells are arranged in the form of follicles. (From Dorland, 27th ed)

A malignant neoplasm characterized by the formation of numerous, irregular, finger-like projections of fibrous stroma that is covered with a surface layer of neoplastic epithelial cells. (Stedman, 25th ed)

Unstable isotopes of iodine that decay or disintegrate emitting radiation. I atoms with atomic weights 117-139, except I 127, are radioactive iodine isotopes.

Surgical removal of the thyroid gland. (Dorland, 28th ed)

The compound is given by intravenous injection to do POSITRON-EMISSION TOMOGRAPHY for the assessment of cerebral and myocardial glucose metabolism in various physiological or pathological states including stroke and myocardial ischemia. It is also employed for the detection of malignant tumors including those of the brain, liver, and thyroid gland. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1162)

The process of observing, recording, or detecting the effects of a chemical substance administered to an individual therapeutically or diagnostically.

A protein extracted from boiled culture of tubercle bacilli (MYCOBACTERIUM TUBERCULOSIS). It is used in the tuberculin skin test (TUBERCULIN TEST) for the diagnosis of tuberculosis infection in asymptomatic persons.

One of several skin tests to determine past or present tuberculosis infection. A purified protein derivative of the tubercle bacilli, called tuberculin, is introduced into the skin by scratch, puncture, or interdermal injection.

Prudent standard preventive measures to be taken by professional and other health personnel in contact with persons afflicted with a communicable disease, to avoid contracting the disease by contagion or infection. Precautions are especially applicable in the diagnosis and care of AIDS patients.

An active immunizing agent and a viable avirulent attenuated strain of Mycobacterium tuberculosis, var. bovis, which confers immunity to mycobacterial infections. It is used also in immunotherapy of neoplasms due to its stimulation of antibodies and non-specific immunity.

Directions or principles presenting current or future rules of policy for assisting health care practitioners in patient care decisions regarding diagnosis, therapy, or related clinical circumstances. The guidelines may be developed by government agencies at any level, institutions, professional societies, governing boards, or by the convening of expert panels. The guidelines form a basis for the evaluation of all aspects of health care and delivery.

Any of the infectious diseases of man and other animals caused by species of MYCOBACTERIUM.

Computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures.

Tomography using x-ray transmission and a computer algorithm to reconstruct the image.

X-ray image-detecting devices that make a focused image of body structures lying in a predetermined plane from which more complex images are computed.

Tumors or cancer of the LUNG.

Either of the pair of organs occupying the cavity of the thorax that effect the aeration of the blood.

A heterogeneous aggregate of at least three distinct histological types of lung cancer, including SQUAMOUS CELL CARCINOMA; ADENOCARCINOMA; and LARGE CELL CARCINOMA. They are dealt with collectively because of their shared treatment strategy.

An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.

Acute and chronic (see also BRAIN INJURIES, CHRONIC) injuries to the brain, including the cerebral hemispheres, CEREBELLUM, and BRAIN STEM. Clinical manifestations depend on the nature of injury. Diffuse trauma to the brain is frequently associated with DIFFUSE AXONAL INJURY or COMA, POST-TRAUMATIC. Localized injuries may be associated with NEUROBEHAVIORAL MANIFESTATIONS; HEMIPARESIS, or other focal neurologic deficits.

The organic and psychogenic disturbances observed after closed head injuries (HEAD INJURIES, CLOSED). Post-concussion syndrome includes subjective physical complaints (i.e. headache, dizziness), cognitive, emotional, and behavioral changes. These disturbances can be chronic, permanent, or late emerging.

A nonspecific term used to describe transient alterations or loss of consciousness following closed head injuries. The duration of UNCONSCIOUSNESS generally lasts a few seconds, but may persist for several hours. Concussions may be classified as mild, intermediate, and severe. Prolonged periods of unconsciousness (often defined as greater than 6 hours in duration) may be referred to as post-traumatic coma (COMA, POST-HEAD INJURY). (From Rowland, Merritt's Textbook of Neurology, 9th ed, p418)

A relatively common sequela of blunt head injury, characterized by a global disruption of axons throughout the brain. Associated clinical features may include NEUROBEHAVIORAL MANIFESTATIONS; PERSISTENT VEGETATIVE STATE; DEMENTIA; and other disorders.

Conditions characterized by persistent brain damage or dysfunction as sequelae of cranial trauma. This disorder may result from DIFFUSE AXONAL INJURY; INTRACRANIAL HEMORRHAGES; BRAIN EDEMA; and other conditions. Clinical features may include DEMENTIA; focal neurologic deficits; PERSISTENT VEGETATIVE STATE; AKINETIC MUTISM; or COMA.

Injuries resulting when a person is struck by particles impelled with violent force from an explosion. Blast causes pulmonary concussion and hemorrhage, laceration of other thoracic and abdominal viscera, ruptured ear drums, and minor effects in the central nervous system. (From Dorland, 27th ed)

A scale that assesses the response to stimuli in patients with craniocerebral injuries. The parameters are eye opening, motor response, and verbal response.

Abnormal outpouching in the wall of intracranial blood vessels. Most common are the saccular (berry) aneurysms located at branch points in CIRCLE OF WILLIS at the base of the brain. Vessel rupture results in SUBARACHNOID HEMORRHAGE or INTRACRANIAL HEMORRHAGES. Giant aneurysms (>2.5 cm in diameter) may compress adjacent structures, including the OCULOMOTOR NERVE. (From Adams et al., Principles of Neurology, 6th ed, p841)

Bleeding into the intracranial or spinal SUBARACHNOID SPACE, most resulting from INTRACRANIAL ANEURYSM rupture. It can occur after traumatic injuries (SUBARACHNOID HEMORRHAGE, TRAUMATIC). Clinical features include HEADACHE; NAUSEA; VOMITING, nuchal rigidity, variable neurological deficits and reduced mental status.

Constriction of arteries in the SKULL due to sudden, sharp, and often persistent smooth muscle contraction in blood vessels. Intracranial vasospasm results in reduced vessel lumen caliber, restricted blood flow to the brain, and BRAIN ISCHEMIA that may lead to hypoxic-ischemic brain injury (HYPOXIA-ISCHEMIA, BRAIN).

Pathological outpouching or sac-like dilatation in the wall of any blood vessel (ARTERIES or VEINS) or the heart (HEART ANEURYSM). It indicates a thin and weakened area in the wall which may later rupture. Aneurysms are classified by location, etiology, or other characteristics.

The tearing or bursting of the weakened wall of the aneurysmal sac, usually heralded by sudden worsening pain. The great danger of a ruptured aneurysm is the large amount of blood spilling into the surrounding tissues and cavities, causing HEMORRHAGIC SHOCK.

Radiography of the vascular system of the brain after injection of a contrast medium.

A method of hemostasis utilizing various agents such as Gelfoam, silastic, metal, glass, or plastic pellets, autologous clot, fat, and muscle as emboli. It has been used in the treatment of spinal cord and INTRACRANIAL ARTERIOVENOUS MALFORMATIONS, renal arteriovenous fistulas, gastrointestinal bleeding, epistaxis, hypersplenism, certain highly vascular tumors, traumatic rupture of blood vessels, and control of operative hemorrhage.

A series of tests used to assess various functions of the eyes.

An independent state in eastern Africa. Ethiopia is located in the Horn of Africa and is bordered on the north and northeast by Eritrea, on the east by Djibouti and Somalia, on the south by Kenya, and on the west and southwest by Sudan. Its capital is Addis Ababa.

Clarity or sharpness of OCULAR VISION or the ability of the eye to see fine details. Visual acuity depends on the functions of RETINA, neuronal transmission, and the interpretative ability of the brain. Normal visual acuity is expressed as 20/20 indicating that one can see at 20 feet what should normally be seen at that distance. Visual acuity can also be influenced by brightness, color, and contrast.

The total area or space visible in a person's peripheral vision with the eye looking straightforward.

Method of measuring and mapping the scope of vision, from central to peripheral of each eye.

Glaucoma in which the angle of the anterior chamber is open and the trabecular meshwork does not encroach on the base of the iris.

An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed)

Rational sequence of tests for pancreatic function. (1/1867)

Of 144 patients with suspected pancreatic disease in whom a 75Se-selenomethionine scan was performed, endoscopic retrograde pancreatography (ERP) was successful in 108 (75%). The final diagnosis is known in 100 patients and has been compared with scan and ERP findings. A normal scan reliably indicated a normal pancreas, but the scan was falsely abnormal in 30%. ERP distinguished between carcinoma and chronic pancreatitis in 84% of cases but was falsely normal in five patients with pancreatic disease. In extrahepatic biliary disease both tests tended to give falsely abnormal results. A sequence of tests to provide a rapid and reliable assessment of pancreatic function should be a radio-isotope scan, followed by ERP if the results of the scan are abnormal, and a Lundh test if the scan is abnormal but the findings on ERP are normal. (+info)

Abnormal responses to rubella infection. (2/1867)

Two cases of rubella are described which caused initial problems in laboratory diagnosis due to abnormal features in the immune response. One patient presented with thrombocytopenic purpura and associated circulating immune complexes. The other patient, who was in early pregnancy, had an unusually prolonged rash and a delayed humoral immune response. The possible reasons for the difficulties in serological confirmation are discussed. (+info)

Intimal tear without hematoma: an important variant of aortic dissection that can elude current imaging techniques. (3/1867)

BACKGROUND: The modern imaging techniques of transesophageal echocardiography, CT, and MRI are reported to have up to 100% sensitivity in detecting the classic class of aortic dissection; however, anecdotal reports of patient deaths from a missed diagnosis of subtle classes of variants are increasingly being noted. METHODS AND RESULTS: In a series of 181 consecutive patients who had ascending or aortic arch repairs, 9 patients (5%) had subtle aortic dissection not diagnosed preoperatively. All preoperative studies in patients with missed aortic dissection were reviewed in detail. All 9 patients (2 with Marfan syndrome, 1 with Takayasu's disease) with undiagnosed aortic dissection had undergone >/=3 imaging techniques, with the finding of ascending aortic dilatation (4.7 to 9 cm) in all 9 and significant aortic valve regurgitation in 7. In 6 patients, an eccentric ascending aortic bulge was present but not diagnostic of aortic dissection on aortography. At operation, aortic dissection tears were limited in extent and involved the intima without extensive undermining of the intima or an intimal "flap." Eight had composite valve grafts inserted, and all survived. Of the larger series of 181 patients, 98% (179 of 181) were 30-day survivors. CONCLUSIONS: In patients with suspected aortic dissection not proven by modern noninvasive imaging techniques, further study should be performed, including multiple views of the ascending aorta by aortography. If patients have an ascending aneurysm, particularly if eccentric on aortography and associated with aortic valve regurgitation, an urgent surgical repair should be considered, with excellent results expected. (+info)

Comparison of standard and CA-125 response criteria in patients with epithelial ovarian cancer treated with platinum or paclitaxel. (4/1867)

PURPOSE: To assess CA-125 as a measure of response in patients treated with paclitaxel. PATIENTS AND METHODS: One hundred forty-four patients treated with paclitaxel derived from four different trials and 625 patients treated with platinum from two trials were analyzed using precisely defined 50% and 75% reductions in CA-125. The standard and CA-125 response rates to paclitaxel and platinum were compared. In addition, we analyzed individual patient groups in which there was a difference in response according to the two response criteria. RESULTS: Patients with stable disease as determined by standard criteria who were treated with platinum and responded according to CA-125 criteria have an improved median progression-free survival compared with patients with stable disease who did not respond according to CA-125 criteria (10.6 v 4.8 months; P<.001). Standard and CA-125 response rates for patients treated with platinum (58.93% v 61.31%, respectively) and paclitaxel (30.65% v 31.67%, respectively) were very similar, as were rates of false-positive prediction of response by CA-125 (platinum 2.2% and paclitaxel 2.9%). Responders to paclitaxel had a significantly improved progression-free survival compared with non-responders by both standard criteria (median progression-free survival, 6.8 v 2.5 months; P<.001) and CA-125 criteria (median progression-free survival, 6.8 v 3.4 months; P<.001). CONCLUSION: Forassessing activity of therapy for ovarian cancer, these data show that precise 50% or 75% CA-125 response criteria are as sensitive as standard response criteria. We propose that they may be used as a measure of response in lieu of or in addition to standard response criteria in clinical trials involving epithelial ovarian cancer. Sensitivity is maintained whether patients are treated with platinum or paclitaxel. (+info)

Recycling, channeling and heterogeneous protein turnover estimation using a model of whole-body protein turnover based on leucine kinetics in rodents. (5/1867)

In the companion paper, a whole-body, mechanistic model of protein turnover in a rodent was described and evaluated with independent data sets that used the flooding dose method. On the basis of fitted fluxes, the model was able to predict specific radioactivity changes in the protein and free leucine pools and whole-body protein fractional synthesis rate (FSR). In this paper, results of model simulations of specific radioactivity changes in the flooding dose, pulse dose and continuous infusion methods were compared and the influence of recycling, channeling and multiple protein pools on model behavior were analyzed. For all methods, the percentage of channeling must be estimated to determine whether the extracellular or intracellular pool specific radioactivities better approximate the aminoacyl tRNA pool specific radioactivity. Recycling also affects the specific radioactivity of the aminoacyl-tRNA pool and therefore must be estimated. An analysis of fits of the flooding dose data indicated that 100% channeling was occurring, but the percentage of recycling could not be determined. Multiple protein pools turning over at different rates overestimated FSR by 2-3% at early time points (5 min) and underestimated FSR by 3-6% at 60 min in the flooding dose method. For the pulse dose method, FSR was underestimated by 40-50% at 5 min and underestimated by 9-10% at 60 min. An increase in time to measure FSR caused a decrease in the estimate of FSR (18% over 3 h) for the flooding dose method and an increase in the estimate of FSR (144% over 3 h) for the pulse dose method. (+info)

HLA-B27 antigen in diagnosis of atypical seronegative inflammatory arthropathy. (6/1867)

Eighteen patients with an inflammatory pauciarticular peripheral arthropathy not typical of any known entity showed an asymmetrical pattern of disease, with a predilection for the lower extremities. Destructive joint changes and deformities were absent (mean follow-up 10 years). Although spondylitis and sacroiliitis were absent on x-rays, HLA-B27 antigen was found in 8 patients (44%). This antigen and similar joint symptoms are also found in other forms of arthritis. (+info)

Radioactive phosphorus uptake testing of choroidal lesions. A report of two false-negative tests. (7/1867)

Two false-negative results from 32P testing for histologically verified malignant melanomas of the choroid are reported. In the first case, a haemorrhagic choroidal detachment caused an increase in probe; additionally, the tumour was necrotic. Both factors are likely to have contributed to the false-negative result. A satisfactory explanation for the false-negative result in the second case was not determined, although it may have accurately reflected a period of minimal tumour activity, inasmuch as repeat 32P testing was strongly positive eight months later, when unequivocal evidence of tumour growth was present. An alternative explanation is that the orally administered 32P was incompletely absorbed. Since 32P testing is frequently accompanied by significant manipulation both in the manoeuvre associated with tumour localization and in that associated with the actual radioactive counting, it would seem desirable to perform indicated enucleation immediately after completion of the 32P testing. While the properly performed 32P test remains a valuable diagnostic test for helping to establish the presence or absence of malignancies of the posterior globe, it is important to guard against the tendency to underestimate careful clinical evaluation. (+info)

An approach to the problems of diagnosing and treating adult smear-negative pulmonary tuberculosis in high-HIV-prevalence settings in sub-Saharan Africa. (8/1867)

The overlap between the populations in sub-Saharan Africa infected with human immunodeficiency virus (HIV) and Mycobacterium tuberculosis has led to an upsurge in tuberculosis cases over the last 10 years. The relative increase in the proportion of notified sputum-smear-negative pulmonary tuberculosis (PTB) cases is greater than that of sputum-smear-positive PTB cases. This is a consequence of the following: the association between decreased host immunity and reduced sputum smear positivity; the difficulty in excluding other HIV-related diseases when making the diagnosis of smear-negative PTB; and an increase in false-negative sputum smears because of overstretched resources. This article examines problems in the diagnosis and treatment of smear-negative PTB in high-HIV-prevalence areas in sub-Saharan Africa. The main issues in diagnosis include: the criteria used to diagnose smear-negative PTB; the degree to which clinicians actually follow these criteria in practice; and the problem of how to exclude other respiratory diseases that can resemble, and be misdiagnosed as, smear-negative PTB. The most important aspect of the treatment of smear-negative PTB patients is abandoning 12-month "standard" treatment regimens in favour of short-course chemotherapy. Operational research is necessary to determine the most cost-effective approaches to the diagnosis and treatment of smear-negative PTB. Nevertheless, substantial improvement could be obtained by implementing the effective measures already available, such as improved adherence to diagnostic and treatment guidelines. (+info)

Agaricus placomyces and Agaricus xanthodermus produce false negative reactions. Sometimes referred to as "Schaeffer's reaction ... Three results are expected with the iron salts tests: no change indicates a negative reaction; a color change to olive, green ... A positive reaction of Schaeffer's test, which uses the reaction of aniline and nitric acid on the surface of the mushroom, is ... "The Meixner test in the detection of alpha-amanitin and false-positive reactions caused by psilocin and 5-substituted ...

https://en.wikipedia.org/wiki/Chemical_test_in_mushroom_identification

False-negative reactions can result when urine with a high specific gravity contains crenated red blood cells that do not lyse ... Traditionally, ascorbic acid (vitamin C) has been associated with false-negative reagent strip reactions for blood. Both ... The formaldehyde used as a preservative produces false negatives in both reactions. Urinary infections can be identified ... The presence of strong oxidising agents or formaldehyde can cause false positives. False negative results are associated with ...

https://en.wikipedia.org/wiki/Urine_test_strip

"Variation in False-Negative Rate of Reverse Transcriptase Polymerase Chain Reaction-Based SARS-CoV-2 Tests by Time Since ... a false negative). Even relatively high sensitivity rates can produce high rates of false negatives in populations with low ... Test errors can be false positives (the test is positive, but the virus is not present) or false negatives, (the test is ... On 4 January 2021, the US FDA issued an alert about the risk of false results, particularly false negative results, with the ...

https://en.wikipedia.org/wiki/COVID-19_testing

A reversal in the order of the reagents being added may result in a weak-positive or false-negative reaction. VP is one of the ... The reaction was developed by Daniel Wilhelm Otto Voges and Bernhard Proskauer, German bacteriologists in 1898 at the Institute ... A cherry red color indicates a positive result, while a yellow-brown color indicates a negative result. The test depends on the ... VP negative organisms include Citrobacter sp., Shigella, Yersinia, Edwardsiella, Salmonella, Vibrio furnissii, Vibrio fluvialis ...

https://en.wikipedia.org/wiki/Voges–Proskauer_test

... as well as false negative reactions in malnourished children. BCG has been used as an antigen in EIAs in in vitro studies to ... False-positive reactions with enzyme-linked immunosorbent assay of Mycobacterium tuberculosis antigens in pleural fluid. J Med ... The ELISA titer indicate the positive or negative result. The diagnosis of TB is most complicated. The routine diagnosis for TB ... But culture need 6-8week with 10-20% false positive results. A rapid serological test for diagnosis, follow-up of disease ...

https://en.wikipedia.org/wiki/Antibodies_from_lymphocyte_secretions

Vitamin C can cause analytical false negatives due to its anti-oxidant properties inhibiting the color reaction. If the card ... This can cause false negative results in upper gastrointestinal bleeding sources, or in right colon adenomas and cancers that ... However, although heme breakdown is less than globin during intestinal transit, false negative results can be seen with the ... Wells HJ, Pagano JF (1977). "Hemoccult test - reversal of false-negative results due to storage". Gastroenterology. 72: 1148. ...

https://en.wikipedia.org/wiki/Stool_guaiac_test

It fosters almost totally negative and destructive reactions in young people. It smells phoney and false. It is sung, played ... He was out of prison, man." Binder said of Presley's reaction, "I played Elvis the 60-minute show, and he told me in the ... According to Moore, "His movement was a natural thing, but he was also very conscious of what got a reaction. He'd do something ... Presley had another attack of nerves during the first set, which drew a muted reaction. A more composed and energetic second ...

https://en.wikipedia.org/wiki/Elvis_Presley

If a minor reaction is considered doubtful, the OT test is less accurate and may fail to detect TB, producing a false negative. ... Indications are usually classified as positive, negative, or doubtful.[2] Because it is not possible to control precisely the ...

https://en.wikipedia.org/wiki/Tine_test

In this case, the result is a false negative. The range of relatively high antibody concentrations within which no reaction ... Stamm AM, Polt SS (September 1980). "False-negative cryptococcal antigen test". JAMA. 244 (12): 1359. doi:10.1001/jama.244.12. ... resulting in false negatives or inaccurately low results. Other common forms of interference include antibody interference, ... The serological test is mainly seen in the precipitation reaction. The antibody that fails to react is known as the blocking ...

https://en.wikipedia.org/wiki/Hook_effect

H 2 -histamine receptor blockers can suppress the cutaneous reaction to histamine, thus resulting in to false negative results ... Allergic reactions: pruritus, urticaria, angioedema, bronchospasm, anaphylactic shock, anaphylactoid reactions. Others: ... histamine receptor blockers before performing diagnostic skin tests to detect an immediate allergic skin reaction). As with the ...

https://en.wikipedia.org/wiki/Ranitidine_bismuth_citrate

... meaning they are very accurate and are very unlikely to have false-negative test results. A polymerase chain reaction (PCR) ... Chlamydia trachomatis is a gram-negative bacterium that can replicate only within a host cell. Over the course of the C. ... The bacterium is still classified as gram-negative C. trachomatis agent was first cultured and isolated in the yolk sacs of ... though the reaction's speed is slower in C. trachomatis.[citation needed] Other research has been conducted to try to get a ...

https://en.wikipedia.org/wiki/Chlamydia_trachomatis

Such a result, which shows as positive, even though the outcome should be negative is called false positive. ... The test shows the reaction of the immune system to tuberculin. This requires an intact immune system: People whose immune ... Similarly, the use of certain substances, such as steroids may lead to false negatives. ... may also show a false negative: Their immune system may simply be too weak to react. ...

https://simple.wikipedia.org/wiki/Mantoux_test

20 animals would typically be used to ensure against false negative results. The OECD Guidelines for the Testing of Chemicals ... and their allergic reaction, if any, measured. 15% of guinea pigs must show a reaction for the test to be considered positive. ... along with an adjuvant to enhance the immune reaction of the guinea pig. During Induction B, the topical induction, the test ...

https://en.wikipedia.org/wiki/Guinea_pig_maximisation_test

The inability to diagnose B. canis by SAT due to lack of cross-reaction is another drawback. False-negative SAT may be caused ... Due to the similarity of the O polysaccharide of Brucella to that of various other Gram-negative bacteria (e.g. Francisella ... by polymerase chain reaction". Croatian Medical Journal. 51 (4): 306-13. doi:10.3325/cmj.2010.51.306. PMC 2931435. PMID ... Brucellosis is a reproductive disease, so has an extreme negative impact on the population dynamics of a species. This becomes ...

https://en.wikipedia.org/wiki/Brucellosis

... while the negative effect of stress causes more false alarms and mistakes when compared to a normal condition. The researchers ... In a study by Duncko et al., the positive effect of stress manifested itself as a decreased reaction time in participants, ... This negative effect on the retrieval of memories caused by stress can be attributed to cortisol, the stress hormone that is ... This is due to the fact that the negative cue is perceived as a factor in the induced stress, whereas the positive cue is not. ...

https://en.wikipedia.org/wiki/Effects_of_stress_on_memory

... but still results in some false negatives, for *0304 the typing efficiency is poor and cross-reaction with DQ8 is relatively ... Bunce M, Taylor CJ, Welsh KI (1993). "Rapid HLA-DQB typing by eight polymerase chain reaction amplifications with sequence- ...

https://en.wikipedia.org/wiki/HLA-DQ7

... ran the risk of setting up false expectations and disappointment in the viewers - which could lead to a negative reaction to ...

https://en.wikipedia.org/wiki/Daria

... his reaction can only be negative."[158][159] ... "The concept of nonviolence is a false ideal. It presupposes the ... and the act of killing in that situation would have minimal negative karmic repercussions.[134] ... are five requisite factors that must all be fulfilled for an act to be both an act of killing and to be karmically negative. ...

https://en.m.wikipedia.org/wiki/Nonviolence

False-negative antibody test result occurring when antibody concentration is so high that agglutination reaction cannot occur, ... The Jarisch-Herxheimer reaction is an immune-mediated response to syphilis therapy occurring within 2-24 hours. The exact ... A positive test confirms neurosyphilis but a negative result does not rule out neurosyphilis. Due to the low sensitivity of the ... mechanisms of reaction are unclear, however most likely caused by proinflammatory treponemal lipoproteins that are released ...

https://en.wikipedia.org/wiki/Neurosyphilis

Such reactions to non-visual stimuli are a widespread cause of false positives and false negatives when pet owners test their ...

https://en.wikipedia.org/wiki/Menace_reflex

... show a normal reaction to the test. The Government argues that such false negatives render the test unreliable." According to ... "Until a way can be devised to detect and/or control false negatives and false positives, the validity of the test data will be ... accurate Results are subject to faking and voluntary control by test subjects High incidence of false negatives and false ... Abel, G. G.; Huffman, J.; Warberg, B.; Holland, C. L. (1998). "Visual reaction time and plethysmography as measures of sexual ...

https://en.wikipedia.org/wiki/Penile_plethysmography

The negative reaction prompted publication of an op-ed in the Times on January 16 entitled "False Note on Black Panthers" that ... "False Note on Black Panthers". The New York Times. January 16, 1970. Bernstein, Felicia M. (January 21, 1970). "Letters to the ...

https://en.wikipedia.org/wiki/Radical_chic

... give rise to false negative tests such as in the case of testing for the aldehydic terminus of glucose. Schiff's reagent on ... The further reaction of the Schiff reagent with aldehydes is complex with several research groups reporting multiple reaction ... Physical-chemical investigations of the color reaction of aldehydes, called the "Schiff reaction"), Annales de Chimie, 11th ... This reaction disrupts the otherwise favored delocalized extended pi-electron system and resonance in the parent molecule. ...

https://en.wikipedia.org/wiki/Schiff_test

... so it seems more cruel in its false depictions". Following some negative reactions to the fourth season, British culture ... Gordonstoun School responded to its negative portrayal, claiming that Prince Charles's personal feedback to the school had been ... raised concerns that some of the episodes are based on false premises. The series received an overall score of 91% on Rotten ... but suggested that the series gave the false implication that the Duke was banished from the royal family upon publication. In ...

https://en.wikipedia.org/wiki/The_Crown_(TV_series)

After heavy negative reactions on social media, the company withdrew the ad. NDTV reported that there was mob attack at Tanishq ... showroom in Kutch district however, it was rejected as false claim by Gujarat police. In a press release the company expressed ...

https://en.wikipedia.org/wiki/Tanishq

A polymerase chain reaction-based test is also available. Although any of these tests can confirm psittacosis, false negatives ...

https://en.wikipedia.org/wiki/Psittacosis

Critical reaction was mixed. Russell Edwards, writing for the film industry trade publication Variety, was negative, ... criticizing the film for its "glacial pace" and saying it was "too flimsy and false to truly engage." Lee Marshall, writing for ...

https://en.wikipedia.org/wiki/Ploy_(film)

As a reaction to this many private organizations have formed whistleblower legal defense funds or support groups to assist ... Those who report a false claim against the federal government, and suffer adverse employment actions as a result, may have up ... The ethical implications of whistleblowing can be negative as well as positive. However, sometimes employees may blow the ... The first US law adopted specifically to protect whistleblowers was the 1863 United States False Claims Act (revised in 1986), ...

https://en.wikipedia.org/wiki/Whistleblower

... there is a possibility for false negative results. Polymerase chain reaction (PCR) may also be used to diagnose plague, by ... they may have a false negative culture and a positive PCR result. Blood tests to detect antibodies against Y. pestis can also ... However, when using the rapid test, both positive and negative results need to be confirmed to establish or reject the ...

https://en.wikipedia.org/wiki/Plague_(disease)

A traditional skin-prick allergy test for allergy to meat may give a false-negative answer. Determination of specific IgE to ... After this reaction, the future intake of mammal meat with the same alpha-gal causes an allergic reaction. Symptoms of the ... A typical allergic reaction to alpha-gal has a delayed onset, occurring 3-8 hours after the consumption of mammalian meat ... In 70% of cases the reaction is accompanied by respiratory distress and as such is particularly harmful to those with asthma. ...

https://en.wikipedia.org/wiki/Alpha-gal_allergy

Public reaction to the book was very strong. Many people were shocked at the extent of food contamination and drug side-effects ... For example, they claimed that bran (roughage) has many negative effects on the intestine,[4] which contradicts today's view ... authors claim that advertising for these drugs is deliberately misleading and uses a variety of dishonest techniques from false ... can potentially have serious negative health impacts that consumers are not made aware of. These impacts are felt by all ...

https://en.wikipedia.org/wiki/100,000,000_Guinea_Pigs

... negative results, etc. Even those with positive results can be better explained as resulting in false positives due to bias and ... Even low-risk medications such as antibiotics can have potential to cause life-threatening anaphylactic reactions in a very few ... Negative outcomes. See also: List of herbs with known adverse effects. Adequacy of regulation and CAM safety. Many of the ... Alternative medicine may lead to a false understanding of the body and of the process of science.[169][178] Steven Novella, a ...

https://en.wikipedia.org/wiki/Integrative_medicine

not-guilty' when making judgments in courts, 'wrong/false' vs. 'right/true' when measuring truth value, and, on the other hand ... Stevens's reaction was not to conduct experiments to test for the presence of additive structure in sensations, but instead to ... Amounts (non-negative real numbers). *Balances (any real number). For example, percentages (a variation on fractions in the ... This conclusion was later rendered false by the discovery of the theory of conjoint measurement by Debreu (1960) and ...

https://en.wikipedia.org/wiki/Numerical_data

My knee-jerk reaction was, "This topic is basically (integers in) quadratic number fields, which are extremely important." But ... I followed the model of square root of negative numbers. For comparison, Special:PrefixIndex/square roots has nothing of the ... As "not very different from" - false, they are algebraic numbers and "integers", after all. These facts are completely obscured ...

https://en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Mathematics

However, due to false positives and variability in results, this test is relied upon less frequently.[16] ... A negative diagnosis experience may cause frustration and could cause a person to reject any further attempts at treatment. ... The individual does not have control of the learned reaction, but this can be retrained to allow the patient to control the ... One hypothesis is that they are a learned physical reaction or habit the body develops, similar to a reflex. ...

https://en.wikipedia.org/wiki/Psychogenic_non-epileptic_seizure

PCR often shows false negative results because few Borrelia cells can be found in blood and cerebrospinal fluid (CSF) during ... Polymerase chain reaction (PCR) tests for Lyme disease have also been developed to detect the genetic material (DNA) of the ... A positive IgM and negative IgG test result after the first month of infection is generally indicative of a false positive ... However, PCR tests are susceptible to false positive results, e.g. by detection of debris of dead Borrelia cells or specimen ...

https://en.wikipedia.org/wiki/Lyme_disease

Hurwitz EL, Morgenstern H, Vassilaki M, Chiang LM (July 2005). "Frequency and clinical predictors of adverse reactions to ... which has led to negative impacts on both public vaccination and mainstream acceptance of chiropractic.[27] The American ... claims which are demonstrably false. The main chiropractic treatment technique involves manual therapy, especially spinal ... adverse reactions appear to be more common following manipulation than mobilization.[139] The most frequently stated adverse ...

https://en.wikipedia.org/wiki/Chiropractors

Opposition leader reaction was swift and scathing, calling his words racist and divisive.[11] ... "the ads they ran were racially-charged false attacks".[41] ...

https://en.wikipedia.org/wiki/Dog-whistle_politics

Job satisfaction is also related to negative health outcomes.[120][121] A literature review[122] and meta-analysis[123] of high ... Fredrikson M., Sundin O., & Frankenhaeuser M. (1985). Cortisol excretion during the defence reaction in humans. Psychosomatic ... Examples of workplace incivility include insulting comments, denigration of the target's work, spreading false rumors, social ... Fredikson, Sundin, and Frankenhaeuser (1985) found that reactions to psychological stressors include increased activity in the ...

https://en.wikipedia.org/wiki/Occupational_health_psychology

... or Lattice Enabled Nuclear Reactions; one of the reasons being to avoid the negative connotations associated with "cold fusion ... Rousseau, D. L. (January-February 1992), "Case Studies in Pathological Science: How the Loss of Objectivity Led to False ... Chemically Assisted Nuclear Reactions (CANR),[79] Lattice Assisted Nuclear Reactions (LANR), Condensed Matter Nuclear Science ( ... Huizenga 1993, p. viii "Enhancing the probability of a nuclear reaction by 50 orders of magnitude (...) via the chemical ...

https://en.m.wikipedia.org/wiki/Cold_fusion

Using T, F for "true" and "false" and ? for undecided, there are exactly nine positions regarding determinism/free will that ... The authors concluded, in their paper, that it is belief in determinism that causes those negative effects.[206] This may not ... Conversely, determinism is the belief that everything operates under cause and effect; every action determines a reaction. ... The notion that all propositions, whether about the past, present or future, are either true or false. The problem of free will ...

https://en.wikipedia.org/wiki/Free_will

Allergic reactions to ginger generally result in a rash.[2] Although generally recognized as safe, ginger can cause heartburn ... If consumed in reasonable quantities, ginger has few negative side effects.[38] It is on the FDA's "generally recognized as ... false stems made of the rolled bases of leaves) about one meter tall bearing narrow leaf blades. The inflorescences bear ...

https://en.wikipedia.org/wiki/Ginger

... which received extremely negative reactions, including from activist Tamika Mallory, with whom he later had a heated exchange ... false arrest and imprisonment, malicious prosecution, abuse of process and negligence.[3][4][5] ... Reactions. (to the murder · to the protests). Law enforcement. *2020 deployment of federal forces in the United States * ... for weeks after Taylor's death there was very little public reaction, little response from government officials,[117] and the ...

https://en.wikipedia.org/wiki/Shooting_of_Breonna_Taylor

Reactions. Condolences flooded in from across the world, led by the Queen. Other messages came from Pope John Paul II, US ... The false allegations on the front page of The Sun on 19 April 1989 ... Of those statements, 116 were amended to remove or change negative comments about South Yorkshire Police. South Yorkshire ... The extreme reaction to Mr Bigley's murder is fed by the fact that he was a Liverpudlian. Liverpool is a handsome city with a ...

https://en.m.wikipedia.org/wiki/Hillsborough_disaster

In practice they confuse and mix it with P. macroceras ("false yohimbe"), a species that contains little yohimbine.[48] ... Blockage of these brain adrenoreceptors appears to reverse a central negative feedback mechanism that regulates penile erection ... yohimbine via an enantioselective organocatalytic Pictet-Spengler reaction". The Journal of Organic Chemistry. 76 (21): 8907-12 ...

https://en.wikipedia.org/wiki/Yohimbine

Negative symptoms. Negative symptoms are thoughts, behaviors or emotions normally present in a healthy person that a person ... Check for reactions to traumatic experiences. *Decide together with a doctor about using medication, taking into account the ... The therapist may design a behavioral experiment for paranoia (false beliefs of danger) that will help the person to find out ... The sign for minus is -; it is also the sign for the word "negative". Negative symptoms includes a 'flat affect'; having a ...

https://simple.wikipedia.org/wiki/Schizophrenic

A third of the respondents believed disclosing their sexual history would result in a negative reaction, and 30% had received a ... The Caliphal court in Baghdad featured women who dressed as men, including false facial hair, but they competed with other ... Nicholas, and a collection called Smith College Stories, without negative views.[78] Enduring loyalty, devotion, and love were ... negative reaction from a medical professional after identifying themselves as lesbian or bisexual.[197] A patient's complete ...

https://en.wikipedia.org/wiki/Lesbians

Mosaicism and chimerism, rare genetic conditions that can result in false negative results on DNA-based tests ... The current techniques for paternity testing are using polymerase chain reaction (PCR) and restriction fragment length ... which can result in a false negative result if their reproductive tissue has a different genetic make-up from the tissue ...

https://en.m.wikipedia.org/wiki/Paternity_test

Other adverse reactionsEdit. Adverse reactions may result from the poor quality of kava raw material used in the manufacturing ... The reduplication of the base form is indicative of falsehood or likeness, in the sense of "false kava".[21][16] In New Zealand ... More rigorous clinical research has found no evidence of any significant negative health issues (including any irreversible ... "Canadian Adverse Reaction Newsletter. 12 (4). 2002.. *^ "Listing of Drugs Currently Regulated as New Drugs (The New Drugs List ...

https://en.m.wikipedia.org/wiki/Kava

This may cause false positive reactions but an individual suffering from anxiety may also avoid real threats. This may explain ... Negative experiences have been illustrated in producing not only negative expectations, but also avoidant, or antagonistic, ... The fear of failing at a task and being negatively evaluated for failure can have a similarly negative effect on the adult.[29] ... Because test anxiety hinges on fear of negative evaluation,[25] debate exists as to whether test anxiety is itself a unique ...

https://en.m.wikipedia.org/wiki/Anxiety

He received the Nobel Prize in Chemistry in 1909 for his work on catalysis, chemical equilibria and reaction velocities. He, ... "Dr Perutz, said: "It is one thing for scientists to oppose creationism which is demonstrably false but quite another to make ... He argued the negative, although his formal position was agnostic, awaiting proof... 'You're so smart, why do you believe in ... Francis Perrin (1901-1992): French physicist, co-establisher of the possibility of nuclear chain reactions and nuclear energy ...

https://en.wikipedia.org/wiki/List_of_atheists_

... three people had a false negative diagnosis of MG, which can mimic ALS and other neurological disorders, leading to a delay in ... "Ice Bucket Challenge: Lady Gaga, Justin Bieber, G-Dragon and Oprah - the most entertaining reactions so far".. ... Mitsumoto H, Brooks BR, Silani V (November 2014). "Clinical trials in amyotrophic lateral sclerosis: why so many negative ... "Avoiding false positive diagnoses of motor neuron disease: lessons from the Scottish Motor Neuron Disease Register". Journal ...

https://en.wikipedia.org/wiki/Lou_Gehrig's_disease

The reaction of acid with carbonates, most commonly found as the polymorph calcite and aragonite (CaCO3), relates to the ... Most varieties of pyroxene consist of permutations of Ca2+, Fe2+ and Mg2+ to balance the negative charge on the backbone. ... Parting, sometimes called "false cleavage", is similar in appearance to cleavage but is instead produced by structural defects ... In other silicate structures, different combinations of elements are required to balance out the resultant negative charge. It ...

https://en.m.wikipedia.org/wiki/Mineral

The false-negative rate of cancer exome sequencing is low-i.e.: the majority of neoantigens occur within exonic sequence with ... Allergen - A substance capable of causing an allergic reaction. The (detrimental) reaction may result after exposure via ... As of 2015 mass spectrometry resolution is insufficient to exclude many false positives from the pool of peptides that may be ... negative selection). Endogenous antigens include xenogenic (heterologous), autologous and idiotypic or allogenic (homologous) ...

https://en.wikipedia.org/wiki/Antigen

Photophobia (biology) - a negative phototaxis or phototropism response, or a tendency to stay out of the light ...

https://en.wikipedia.org/wiki/Hypnophobia

David Gorski and geneticist Adam Rutherford advised caution against proliferation of false and pseudoscientific conclusions by ... The original researchers pointed out negative results in the paper's appendix that the criticism omitted in its calculations, ... Norms of reaction. *Gene-environment interaction. *Gene-environment correlation. *Operon. *Heritability. *Quantitative genetics ...

https://en.wikipedia.org/wiki/Epigenetic

The enzyme reaction will produce a change in colour of the solution that is proportional to the amount of antibody bound to the ... or their ANA converted from positive to negative from steroids, cytotoxic medications, or uremia (kidney failure)."[9] ... "Persistent use of "false" cell lines". Int. J. Cancer. 122 (1): 1-4. doi:10.1002/ijc.23233. PMID 17960586. S2CID 27432788 ... "Only a small percentage have a negative ANA, and many of those have other antibodies (such as anti-phospholipid antibodies, ...

https://en.wikipedia.org/wiki/Anti-nuclear_antibody

Sensitivity of humans varies from extreme allergic reaction to no reaction at all (about 20%). The bite usually produces a ... Proximity of infested dwellings or items, if easy routes are available for travel, e.g. through ducts or false ceilings; ... Resistance to pesticides has increased significantly over time and there are concerns of negative health effects from their ... Symptoms may not appear until some days after the bites have occurred.[5] Reactions often become more brisk after multiple ...

https://en.wikipedia.org/wiki/Bed_Bug

Gross stress reaction is defined as a "normal personality [utilizing] established patterns of reaction to deal with ... negative reminders of the trauma.[214][215] Additional research has been performed to understand the social consequences of the ... False pregnancy. *Intermittent explosive disorder. *Klüver-Bucy syndrome. *Psychogenic non-epileptic seizures ... Posttraumatic stress reactions have not been studied as well in children and adolescents as adults.[10] The rate of PTSD may be ...

https://en.wikipedia.org/wiki/Posttraumatic_stress_disorder

Secondly, it is a way for the campaign to test a variety of messages, both positive and negative, on themselves and their ... Social media today is a popular medium for the candidates to campaign and for gauging the public reaction to the campaigns. ... Recently, concerning the 2016 U.S. presidential election, a major concern has been that of the effect of false stories ... such as positive or negative wording), the adequacy of the number being established quantitatively with psychometric measures ...

https://en.wikipedia.org/wiki/Approval_rating

False-negative RDT results and implications of new reports of P. falciparum histidine-rich protein 2/3 gene deletions ... "False Negative Reactions". 0-9. A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P. Q. R. S. T. U. V. W. X. Y. Z. * 0-9 ...

https://extranet.who.int/iris/restricted/browse?authority=False+Negative+Reactions&type=mesh

... 0-9. A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P. Q. R. S. T. U ...

https://extranet.who.int/iris/restricted/handle/10665/26724/browse?authority=False+Negative+Reactions&type=mesh

false-negative reaction answers are found in the Tabers Medical Dictionary powered by Unbound Medicine. Available for iPhone, ... reaction. False-negative Reaction [Internet]. In: Venes DD, editors. Tabers Medical Dictionary. F.A. Davis Company; 2021. [ ... reaction. Accessed February 26, 2021.. False-negative reaction. (2021). In Venes, D. (Ed.), Tabers Medical Dictionary (24th ... false-negative reaction is a topic covered in the Tabers Medical Dictionary. To view the entire topic, please log in or ...

https://www.tabers.com/tabersonline/view/Tabers-Dictionary/730121/all/false_negative_reaction

What is false-negative reaction? Meaning of false-negative reaction medical term. What does false-negative reaction mean? ... Looking for online definition of false-negative reaction in the Medical Dictionary? false-negative reaction explanation free. ... medical-dictionary.thefreedictionary.com/false-negative+reaction,false-negative reaction,/a,. *Facebook ... false-negative reaction. false-·neg·a·tive re·ac·tion. an erroneous or mistakenly negative response. ...

https://medical-dictionary.thefreedictionary.com/false-negative+reaction

"False Negative Reactions" by people in this website by year, and whether "False Negative Reactions" was a major or minor topic ... "False Negative Reactions" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical ... False Negative Reactions*False Negative Reactions. *False Negative Reaction. *Reaction, False Negative ... Below are the most recent publications written about "False Negative Reactions" by people in Profiles. ...

https://reach.sickkids.ca/display/7715

"False Negative Reactions" by people in this website by year, and whether "False Negative Reactions" was a major or minor topic ... "False Negative Reactions" by people in Profiles.. * Lantos JD. The False-negative Phenotype. Pediatrics. 2019 01; 143(Suppl 1): ... "False Negative Reactions" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical ... False Negative Reactions*False Negative Reactions. *False Negative Reaction. *Reaction, False Negative ...

https://researchers.childrensmercy.org/display/7687

False-Negative Reactions. Not all infected persons will have a delayed hypersensitivity reaction to a tuberculin test. ... False Positive Reactions. False positive tuberculin reactions can occur in individuals who have been infected with other ... Negative Reactions. An individual who does not show a positive reaction to 5 TU on the first test, but is suspected of being TB ... Impaired or attenuated cell mediated immunity (CMI) can potentially cause a false negative tuberculin reaction. Many factors ...

https://www.drugs.com/dosage/tubersol.html

False positive or false negative tuberculin skin test reactions may occur in some individuals. (See Interpretation of the Test ... False-Negative Reactions. Not all infected persons will have a delayed hypersensitivity reaction to a tuberculin test. ... False Positive Reactions. False positive tuberculin reactions can occur in individuals who have been infected with other ... Negative Reactions. An individual who does not show a positive reaction to 5 TU on the first test, but is suspected of being TB ...

https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=261efc52-a105-4c2c-a8ce-9eee20b62efc

False-negative Reactions eBooks, False-negative Reactions Publications, False-negative Reactions Publishers Description: Read ... interactive False-negative Reactions publications at FlipHTML5, download False-negative Reactions PDF documents for free. ... Incorrect bottle of antigen used Why is Two-Step Testing Conducted? What Are False-Negative Reactions? Two-step testing is ...

https://fliphtml5.com/tags/false-negative%20reactions/1

False Negative Reactions * Female * Follow-Up Studies * Humans * Lung Neoplasms / diagnostic imaging* ...

https://pubmed.ncbi.nlm.nih.gov/11139308/?dopt=Abstract

False Negative Reactions * False Positive Reactions * Female * Humans * Male * Middle Aged * Radiopharmaceuticals ...

https://pubmed.ncbi.nlm.nih.gov/10451861/?dopt=Abstract

False Negative Reactions [‎3]‎. * * Browsing by Subject * IRIS Home * Browsing by Subject ...

https://apps.who.int/iris/browse?rpp=20&sort_by=-1&type=mesh&etal=-1&starts_with=F&order=ASC

... and were considered false negatives based on the CITT. The maintenance of these false-negative animals in herds has serious ... False-negative reactions to the comparative intradermal tuberculin test for bovine tuberculosis / Reações falso-negativas ao ... False Negative Reactions / Mycobacterium bovis / Neck Clinical aspect: Diagnosis Limits: Animals Language: English Journal: ... False-negative reactions to the comparative intradermal tuberculin test for bovine tubercu ...

https://search.bvsalud.org/gim/resource/en/biblio-895400

False-negative Chlamydia polymerase chain reaction result caused by a cryptic plasmid-deficient Chlamydia trachomatis strain in ... can cause false-negative results. Here we report the presence in Australia of a C. trachomatis strain lacking the cryptic ... can cause false-negative results. Here we report the presence in Australia of a C. trachomatis strain lacking the cryptic ... but a negative result in our confirmatory in-house polymerase chain reaction (PCR) method targeting the chlamydial cryptic ...

https://research-repository.griffith.edu.au/handle/10072/393749

False-Negative Results of Real-Time Reverse-Transcriptase Polymerase Chain Reaction for Severe Acute Respiratory Syndrome ... yet several recent studies have reported false-negative results of real-time reverse-transcriptase polymerase chain reaction ( ... False-negative results; COVID-19; Computed tomography; Laboratory examination; SARS-COV-2; rRT-PCR ... rRT-PCR). Here, we report two representative false-negative cases and discuss the supplementary role of clinical data with rRT- ...

https://phgkb.cdc.gov/PHGKB/phgHome.action?action=forward&dbsource=cov&id=4119

False-Negative Reactions False-negative tuberculin skin-test reactions have many potential causes (1). Nonresponsiveness to ... False-Positive Reactions A small percentage of tuberculin reactions may be caused by errors in administering the test or in ... If the second result is negative, the person is probably uninfected, and a positive reaction to subsequent tests indicates a ... the reactions in low-risk children are often false-positive. School-based screening for TB infection among children was started ...

https://wonder.cdc.gov/wonder/prevguid/m0038873/m0038873.asp

False Negative Reactions. Humans. Latex Fixation Tests*. Male. Rheumatoid Factor / blood*. von Willebrand Diseases / blood, ...

http://www.biomedsearch.com/nih/Possibility-potential-VWD-misdiagnosis-misclassification/11426494.html

... and initial false-negative angiograms are reported. In both cases, the initial angiogram was of adequate technical quality and ... False Negative Reactions. Female. Humans. Intracranial Thrombosis / radiography*. Reproducibility of Results. Subarachnoid ... The cases of 2 children with true aneurysmal subarachnoid hemorrhages (SAHs) and initial false-negative angiograms are reported ... transient aneurysm sac thrombosis was the most likely explanation for the initial false-negative studies. It is particularly ...

http://www.biomedsearch.com/nih/Thrombosis-subsequent-recanalization-ruptured-intracranial/20367338.html

False Negative Reactions. Negative test results in subjects who possess the attribute for which the test is conducted. The ... False Positive Reactions. Positive test results in subjects who do not possess the attribute for which the test is conducted. ... Carbapenemase-producing organisms (CPOs) are Gram-negative bacteria that are typically resistant to most or all antibiotics and ... and transfusion reactions). The indirect test is applied to serum to detect the presence of antibody (e.g., in detection of ...

https://www.bioportfolio.com/resources/pmarticle/2640572/Amsler-grid-test-for-detection-of-advanced-glaucoma-in-Ethiopia.html

No immune system reaction? False negative result in someone who actually has Lyme. You say, about 10 years ago, my sister ... Suppressed immune system can mean a false negative test, because the test is measuring the reaction of your immune system. That ... Virginia doctors are required to disclose to patients that false negatives are common in Lyme testing. It also states that 25% ... www.nbcwashington.com/news/local/Virginia-to-Require-Doctors-to-Inform-Patients-About-Lyme-Disease-False-Negatives-199448441. ...

https://www.medhelp.org/posts/Lyme-Disease/Getting-tested-againsigh/show/2437240

False negative DNA polymerase chain reaction in an infant with subtype C human immunodeficiency virus type 1 infection. Kline, ...

https://journals.lww.com/pidj/toc/2002/09000

False positive and negative reactions may occur 14 Myasthenia gravis auto-immune destruction of acetylcholine receptors at ...

https://www.brainscape.com/flashcards/immune-mediated-disease-in-clinical-pract-2177809/packs/2846944

... increases the risk of a systemic reaction from the skin-test dose. A 10% rate of false negative skin test reactions has been ... A negative allergic history and absence of reaction to a properly applied skin test do not rule out the possibility of an ... Also, a negative skin test has no bearing on whether or not delayed serum reactions (serum sickness) will occur after ... In skin-test-negative patients, Antivenin caused a true immediate sensitivity reaction in less than 1 percent of patients.10 ...

https://www.rxlist.com/rattlesnake-antivenin-drug.htm

Includes: pharmacology, pharmacokinetics, contraindications, interactions, adverse reactions and more. ... False-negative reaction using glucose-oxidase tests for glucosuria; false-positive urine ketones; false diagnosis for ... Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin ... Of particular concern is the development of hypertensive reactions when levodopa is used with nonselective MAOI. Management: ...

https://www.drugs.com/ppa/levodopa-carbidopa-and-entacapone.html

... so false-positive reactions or false-negative reactions can occur with tuberculin tests. But both IGRAs use more specific M.Tb ... and/or is positive for polymerase chain reaction for M.Tb. However false-negative reactions can occur with these tuberculin ... Among the 54 cases with spontaneous nystagmus, the average length of hospitalization was shorter in patients with negative head ...

https://www.jstage.jst.go.jp/browse/otoljpn/25/3/_contents/-char/en

People can have false negative reactions to the skin testing. Where you off all antihistamines for a least a week prior to ... Sorry to hear you had to experience an anaphylactic reaction. They are truly scary. Its not too common to be negative to both ... My RAST tests are negative, however a couple of my skin tests have been both positive and negative. I know there are a few ... With the last reaction I passed out on the way to the hospital. WIth an attack I always get it 2 hours after eating and get ...

https://www.healingwell.com/community/default.aspx?f=7&m=1199261

Drug-diagnostic tests. Allergy skin tests: false-negative reactions. Drug-behaviors. Alcohol use: additive CNS depression ... adverse effects Among the more serious adverse reactions are skin rash, hypersensitivity reactions, and tachycardia. Drowsiness ... Allergy symptoms; management of anaphylaxis and transfusion reactions. Adults: 4 mg q 4 to 6 hours P.O. or 8 to 12 mg P.O. of ... Adverse reactions. CNS: dizziness, drowsiness, excitation (in children), sedation, poor coordination, fatigue, confusion, ...

https://medical-dictionary.thefreedictionary.com/Calimol

Categories: False Negative Reactions Image Types: Photo, Illustrations, Video, Color, Black&White, PublicDomain, ...

https://phil.cdc.gov/AdvancedSearchResults.aspx?Search=False+Negative+Reactions&parentid=8243&catid=10397

These results are similar to those found for false negative reactions against HF. The heterogeneity and thus the limited value ... In addition, reasons for the presence of false negative results are similar to those found when the HF is used as antigenic ... Se reported in these studies varied from 64.8% to 100%. Reasons for false negative results depend on several factors comprising ... was attributed to false negative results due to patients with Echinococcus genotypes other than G1. Nevertheless, additional ...

https://www.hindawi.com/journals/bmri/2015/428205/

Methods: A rectal swab from a male in his 50s provided a positive result for C. trachomatis using the Roche Cobas 4800 test, but a negative result in our confirmatory in-house polymerase chain reaction (PCR) method targeting the chlamydial cryptic plasmid. (edu.au)
False-Negative Results of Real-Time Reverse-Transcriptase Polymerase Chain Reaction for Severe Acute Respiratory Syndrome Coronavirus 2: Role of De. (cdc.gov)
False-Negative Results of Real-Time Reverse-Transcriptase Polymerase Chain Reaction for Severe Acute Respiratory Syndrome Coronavirus 2: Role of Deep-Learning-Based CT Diagnosis and Insights from Two Cases. (cdc.gov)
The nucleic acid test or genetic sequencing serves as the gold standard method for confirmation of infection, yet several recent studies have reported false-negative results of real-time reverse-transcriptase polymerase chain reaction (rRT-PCR). (cdc.gov)
Eligibility criteria and data analysis Eligible studies measured sensitivity or specificity, or both of a covid-19 serological test compared with a reference standard of viral culture or reverse transcriptase polymerase chain reaction. (bmj.com)
Polymerase chain reaction-based identification and genotyping of Anopheles mosquitoes with a 96-pin bacterial replicator. (ajtmh.org)
A simple method for rapid identification of large numbers of Anopheles mosquitoes was developed based on polymerase chain reaction (PCR) amplification of the rDNA intergenic spacer and internal transcribed spacer 2. (ajtmh.org)
For the 151 samples with HIV-1 RNA ≥400 copies/mL for both assays, a good linear correlation was found (r = 0.81, P Abbott assay performed well in our setting, offering an alternative methodology for HIV-1 VL for laboratories with realtime polymerase chain reaction (PCR) capacity. (worldwidescience.org)
Syphilis can be detected by polymerase chain reaction (PCR), but clinical diagnostic PCR assays cleared by the U.S. Food and Drug Administration (FDA) are not yet available. (arupconsult.com)
Main outcome measures Sensitivity, specificity, and positive and negative predictive values of Veritor System (Beckton Dickinson) and Biosensor (Roche Diagnostics) rapid antigen tests, with reverse-transcriptase polymerase chain reaction (RT-PCR) testing as reference standard. (bmj.com)
Complementary polymerase chain reaction (PCR) primers based upon unique sequences in the internal transcribed spacer (ITS) regions of the nuclear ribosomal DNA (nrDNA) of small broomrape were developed. (plantmanagementnetwork.org)
There are many reasons for a patient to have a negative result from a test using reverse transcriptase-polymerase chain reaction (RT-PCR), as outlined in Table 1 . (cfp.ca)

The proportion of false positives in the RIA test was low. (ajtmh.org)
The test yields false positives for some compounds, such as psilocin. (wikipedia.org)
You have a number of false positives and then delayed reactions or false negatives. (bogleheads.org)
5 When using an antibody test to confirm the diagnosis, it is critical to know which test was performed and the specificity and sensitivity of the test, as many will have high rates of false positives and/or false negatives. (acoem.org)
It has a lot of false positives and the definite test is blood culture. (co.zw)
Pure cultures analysis indicated that one of the single-locus assay had very high prevalence of false positives (Positive predictive value = 77.8%) and was excluded from further analysis. (biomedcentral.com)
Indeed, some studies have involved phased patch testing schedules to avoid false-positives due to this syndrome. (cosmeticsandtoiletries.com)
ALA IS ASSOCIATED WITH such risks as phototoxic reactions, hypersensitivity reactions, and interpretation errors (false-negatives and false-positives). (ascopost.com)

Characteristically, delayed hypersensitivity reactions to tuberculin begin at 5 to 6 hours, are maximal at 48 to 72 hours and subside over a period of days. (nih.gov)
Clinically, a delayed hypersensitivity reaction to tuberculin is a manifestation of previous infection with M tuberculosis or a variety of non-tuberculosis bacteria. (nih.gov)
indications It is prescribed in the treatment of a variety of hypersensitivity reactions, including rhinitis, skin rash, and pruritus. (thefreedictionary.com)

Conclusions: The recognition of a plasmid-deficient strain of C. trachomatis within Australia highlights further limitations of using the chlamydial cryptic plasmid for C. trachomatis diagnostics and re-emphasises the benefits of using multitarget assays to avoid false-negative results. (edu.au)
Contamination with HIV antibody may be responsible for false positive results in specimens tested on automated platforms running HIV 4th generation assays in a region of high HIV prevalence. (nih.gov)
Such assays cannot be applied on clinical samples, which often contain both coagulase-negative staphylococci (CoNS) and S. aureus , either of which can carry mecA . (biomedcentral.com)
The results indicate that high prevalence of false-positive and false-negative reactions occurs in such assays. (biomedcentral.com)

The sensitivity, specificity, positive predictive value and negative predictive value of Abbott to detect HIV-1 RNA ≥400 copies/mL were 91.8%, 100%, 100% and 92.2%, respectively. (worldwidescience.org)
The included articles were required to report sensitivity, specificity, and positive and negative predictive values, or to provide sufficient data for the construction of a 2x2 contingency table. (york.ac.uk)
The sensitivity, specificity, and positive and negative predictive values were calculated from each study using the method of Sackett et al. (york.ac.uk)
SPTs and RASTs exhibited high levels of sensitivity, specificity, positive predictive values (PPVs), negative predictive values (NPVs), and overall efficiency. (peanutallergy.com)
Furthermore, assume that the PCR test returns positive in 75% with SARS-CoV-2 (75% sensitivity) and returns negative in 95% without SARS-CoV-2 (95% specificity). (bmj.com)
Even when there is clear evidence that the reaction is allergic in nature, ascertaining the clinical relevance of the patch test requires knowledge of technical aspects relating to specificity and sensitivity issues. (cosmeticsandtoiletries.com)

Systemic reactions, such as hand dermatitis or generalized eczematous reactions, can occur due to dietary nickel or cobalt ingestion. (hindawi.com)
False-negative results may occur when occult blood is not uniformly distributed throughout the stool. (labcorp.com)
The strip is then left to stand for the time necessary for the reactions to occur (usually 1 to 2 minutes), and finally the colours that appear are compared against the chromatic scale provided by the manufacturer. (wikipedia.org)
A false negative reaction may occur in the ferricyanide test for blood glucose. (pediatriconcall.com)
There is cross-reactivity among drugs of the same class, but reactions may occur less often with certain ones - vecuronium, for example). (allergyweb.com)
Most false-negative results occur at lower parasite densities. (biomedcentral.com)
Apart from false-positive reactions from irritancy, there is a possibility that other false-positive reactions can occur from cross-reactions where patients react to substances that are not the primary sensitizers that initially induced the allergic state. (cosmeticsandtoiletries.com)

Allergy to any component of TUBERSOL or an anaphylactic or other allergic reaction to a previous test of tuberculin PPD is a contraindication to the use of TUBERSOL. (nih.gov)
You should not receive this medicine if you have had an allergic reaction to a previous tuberculin skin test. (stlukes-stl.com)

Negative test results in subjects who possess the attribute for which the test is conducted. (sickkids.ca)
Acute HIV Infection in a Patient with Repeat HIV Antibody/Antigen Negative Results Presenting at an Urban Emergency Department: A Case Report. (sickkids.ca)
Maclean JE, Solomon M, Corey M, Selvadurai H. Cystic fibrosis newborn screening does not delay the identification of cystic fibrosis in children with negative results. (sickkids.ca)
Among the 53 animals analyzed using the CITT, 32 (60.4%) were negative, 14 (26.4%) were positive and seven (13.2%) results were inconclusive. (bvsalud.org)
A total of 24/32 (75.0%) of the animals with negative CITT results were culture positive (confirmed by PCR ) and were considered false negatives based on the CITT. (bvsalud.org)
Background: The 7.5-kb chlamydial cryptic plasmid remains a widely used sequence target for Chlamydia trachomatis nucleic acid amplification tests, but sequence variation in this plasmid, particularly a previously reported 377-bp deletion, can cause false-negative results. (edu.au)
Here, we report two representative false-negative cases and discuss the supplementary role of clinical data with rRT-PCR, including laboratory examination results and computed tomography features. (cdc.gov)
In this respect, crude antigens are used to detect specific antibodies in patients, giving rise to false positive results. (hindawi.com)
False-negative ratio refers to the ratio of subjects affected by an illness whose test results wrongly suggest they are disease free to all those subjects who have the disease. (ebscohost.com)
Molecules with comparable characteristics in e.g. photometry, leading to false-positive results. (eppendorf.com)
False FIT results common with small, nonpolypoid colorectal adenomas, early cancer. (ebscohost.com)
The article presents the study conducted in Taiwan as of August 2013, which showed that patients with early-stage colorectal cancer and those with small or nonpolypoid adenomas have higher possibility of receiving false-negative results from fecal immunochemical testing. (ebscohost.com)
False-negative results of Hemoccult test in colorectal cancer. (ebscohost.com)
Guaiac-based tests for occult blood in stool suffer from a number of drawbacks, leading to a reduction in their sensitivity as well as production of false-positive results. (labcorp.com)
Alternatively, presumptive exclusion of HIV-1 infection can be based on 1 positive HIV-1 virologic test with at least 2 subsequent negative virologic test results (at least 1 of which is performed at ≥8 weeks of age) or negative HIV-1 antibody test results (at least 1 of which is performed at ≥6 months of age). (aappublications.org)
Definitive exclusion of HIV-1 infection is based on 2 negative virologic test results, 1 obtained at ≥1 month of age and 1 obtained at ≥4 months of age, or 2 negative HIV-1 antibody test results from separate specimens obtained at ≥6 months of age. (aappublications.org)
Results were generally positive, although some false-negative findings were observed. (ajtmh.org)
Upon re-testing those with sufficient material available by CAP/CTM, all showed negative results. (worldwidescience.org)
The decreased PPV may either be due to false positive CAP/CTM results, or increased sensitivity compared to the Amplicor assay. (worldwidescience.org)
Criteria were formulated for defining presumed false-positive results. (worldwidescience.org)
Inaccurate pipetting could lead to test-reaction failure or, even worse, false negative or false positive test results. (environmental-expert.com)
R46064 gave false-negative test results because the isolate had a Sabin3 vaccine sequence in the regions corresponding to the probe and primers of the VDPV assay ( Technical Appendix Figure 2). (cdc.gov)
Testing the finished products often results in false-negative reactions, and consequently the allergen (suggested concentration 0.05% in petrolatum) should preferably be tested separately. (unboundmedicine.com)
Hence a Widal test performed early in the first week may give negative results. (co.zw)
Results are uninterpretable if a wheal and flare is present where the negative saline control was applied (i.e., dermatographism), or if there is no reaction to histamine (pt. (allergyweb.com)
The Study One-hundred twenty patients were challenged with a cat exposure model after first evaluating by history, skin prick tests (SPTs), intradermal skin tests (IDSTs) if SPT results were negative, and in vitro allergy testing using Pharmacia & Upjohn technology. (peanutallergy.com)
False positive results of TFE3 protein were observed in three tumors. (physiciansweekly.com)
Two applications of the chromogenic cephalosporin test, using uninduced strains and strains grown on blood agar plates, gave a large number of false negative and false positive results. (lu.se)
Prozone means false-negative or false-low results in antigen-antibody reactions, due to an excess of either antigen or antibody. (biomedcentral.com)
Negative and faint HRP-2 lines accounted for four (3.8%) and 15 (14.4%) of the 104 prozone results in two RDT brands. (biomedcentral.com)
However, false-negative results have been reported also at high parasite densities. (biomedcentral.com)
False-positive reactions can also arise from phenomena such as the Excited Skin Syndrome in which positive test results from numerous patches cannot be reproduced when the patient is later retested. (cosmeticsandtoiletries.com)

The positive and negative predictive values were 73% and 98% respectively. (nih.gov)

She gave me 4 epi pens to carry with me, plus an inhaler (the anaphylactic reactions cause immediate breathing issues for me) - and basically said that I should self-monitor my foods and any exposures, and to NEVER be skin or "challenge" tested again, due to the severity of the reaction! (healingwell.com)
Of course, I've read some horror stories on this board w/regards to anaphylactic reactions to skin pricks. (peanutallergy.com)

2] The prevalence of this false-negative reaction does vary depending on reagent strip brand, with some brands showing greater sensitivity than others. (thefreedictionary.com)

The direct test is applied to red cells which have been coated with antibody in vivo (e.g., in hemolytic disease of newborn, autoimmune hemolytic anemia, and transfusion reactions). (bioportfolio.com)

A negative enzyme-linked immunosorbent assay for anti-total histone antibodies excluded a false-positive reaction. (nih.gov)
Patients with past history of enteric fever may have salmonella antibodies and hence may show false negative reactions. (co.zw)

Mycobacterium bovis BCG or infected with mycobacteria children were identified by visiting the households of other than M . tuberculosis can have false-positive TST adults whose TB had been diagnosed at enrollment in a separate study of TB diagnosis from September 2003 to November 2004 ( 10 ). (cdc.gov)

7) Subsequent restimulation of these sensitized lymphocytes with the same or a similar antigen, such as the intradermal injection of TUBERSOL, evokes a local reaction mediated by these cells. (nih.gov)
If negative at 15-20 minutes, perform intradermal test. (allergyweb.com)

anaphylaxis and negative blood and skin tests? (healingwell.com)
Hi, sorry that you are having the negative tests with the anaphylaxis experiences! (healingwell.com)

Contacts of adults with tuberculosis (TB) are at risk for reactions, and those with malnutrition, measles, and HIV infection. (cdc.gov)

However, the usefulness of this method is limited by false-positive reactions due to cross-reaction with other Gram-negative bacteria. (mendeley.com)

or 1 negative HIV-1 antibody test result obtained at ≥6 months of age. (aappublications.org)
Many clinicians confirm the absence of HIV-1 infection with a negative HIV-1 antibody assay result at 12 to 18 months of age. (aappublications.org)
In the case of suspected COVID-19 with a negative RT-PCR result, the use of a reliable and validated antibody test could potentially be helpful . (acoem.org)

The maintenance of these false-negative animals in herds has serious implications for the control of the disease , since they can be a source of infection . (bvsalud.org)
The only evidence of infection may be a reaction to a tuberculin skin test. (cdc.gov)
When given a TST years after infection, these persons may have a false-negative reaction. (uintacounty.com)
This two-step approach can reduce the likelihood that a boosted reaction to a subsequent TST will be misinterpreted as a recent infection. (uintacounty.com)

They gave me 2 steriod shots in my lower back area to block the histamine reaction from going through my body. (healingwell.com)
Positive (Histamine) and negative (saline) controls must be used. (allergyweb.com)

She was sure that the blood test would clarify the problem, with the obviously severe allergic reaction. (healingwell.com)
The false-negative ratio of a test is useful in determining the test's reliability (i.e., the higher the ratio, the less reliable the test). (ebscohost.com)
A test result that wrongly suggests that a particular disease or condition is not present is referred to as false negative. (ebscohost.com)
False-negative reaction refers to a test result that is negative in an individual who nonetheless has the attribute or disease being tested for. (ebscohost.com)
False-positive reaction refers to a test result that is positive in a person who is actually healthy. (ebscohost.com)
The skin test reaction should be read between 48 and 72 hours after administration. (uintacounty.com)
Therefore, routine serologic testing of these infants and young children is generally only informative before the age of 18 months if the test result is negative. (aappublications.org)
Drug/Laboratory Test Interactions: Cephalosporin antibiotics may produce a false positive reaction for glucose in the urine with copper reduction tests (Benedict's or Fehling's solution or with Clinitest tablets), but not with enzyme-based tests for glycosuria. (pediatriconcall.com)
Concomitant indomethacin: may get false-negative on dexamethasone suppression test. (empr.com)
Patients vaccinated against salmonella may show false positive reactions which can be verified with another Widal test in the next week. (co.zw)
False negative pregnancy tests and what causes them If you take a home pregnancy test too early, you may get a false negative result. (answers.com)
Some patients may have a false-positive or false-negative reaction to a tuberculin skin test. (stlukes-stl.com)
Erikstam U, Bruze M, Goossens A (2001) Degradation of triglycidyl isocyanurate as a cause of false-negative patch test reaction. (springer.com)
The disc diffusion test with penicillin G and the cloverleaf method could not separate beta-lactamase-positive from beta-lactamase-negative strains. (lu.se)
1% of patients in the first 6 weeks after surgery were chills, photosensitivity reaction, solar dermatitis, hypotension, abnormal liver function test, and diarrhea. (ascopost.com)

4 A negative RT-PCR result should therefore not exclude a diagnosis of COVID-19 if the diagnosis is strongly suspected on clinical grounds. (acoem.org)
In nickel allergic contact dermatitis-one of the more familiar clinical correlations-there is a high ratio of false-positive and false-negative reactions. (cosmeticsandtoiletries.com)

None of these six research groups to report negative findings - which in the case of the UK included Professor John Gow, Dr Jonathan Kerr and Dr Jonathan Stoye and used patient samples from physicians including Dr Abhijit Chaudhuri and Professor Peter Behan - have been able to find XMRV in blood samples from ME/CFS patients, or in the healthy controls. (meassociation.org.uk)
We identified 425 (36.6%) COVID-19 positive patients including 155 (13.3%) diagnosed with CT-scan only, while 737 (63.4%) patients were COVID-19 negative. (nature.com)
With a median follow-up of 2.1 (1.6-2.4) months, 310 (26.7%) deaths were reported including 143 (33.6%) in the COVID-19 positive population, and 167 (22.7%) in the COVID-19 negative patients. (nature.com)
Positive correlations of concomitant reactions in different pairs of components of the fragrance mix have also been recorded in polyreactive patients. (cosmeticsandtoiletries.com)

As appropriate, review all other significant and life-threatening adverse reactions and interactions, especially those related to the drugs, tests, and behaviors mentioned above. (thefreedictionary.com)

For persons who are otherwise at low risk and are tested at the start of employment, a reaction of ≥15 mm induration is considered positive. (drugs.com)
The reaction should be measured in millimeters of the induration (palpable, raised, hardened area or swelling). (uintacounty.com)

false-positive reaction. (ebscohost.com)
A definition of the medical term "false-positive reaction" is presented. (ebscohost.com)
N.B. what constitutes a positive reaction is not at all standardized, it is different for different authors. (allergyweb.com)

Interpretation of semiquantitative reagent strips, which are colorimetric tests, requires knowledge of urine color because discolored urine may result in a false-positive result. (merckvetmanual.com)

Use standard dilutions , the highest dilutions that have been shown to not cause irritant or non-specific reactions in controls. (allergyweb.com)
There is an association between erythematous reactions to some allergens and irritant reactions to sodium lauryl sulfate. (cosmeticsandtoiletries.com)
This association is a putative marker for hyper-reactive skin, thus allowing many reactions of this type to be classified as irritant rather than allergic in nature. (cosmeticsandtoiletries.com)

An example of a false positive is a mammography result which suggests that a patient's has breast cancer, but subsequent. (ebscohost.com)
A negative result can be obtained even when a gastrointestinal disorder is present. (labcorp.com)
Which of the following situations can result in a false-negative reaction with Rh typing reagents? (labce.com)
A negative beta-HCG result effectively excludes the diagnosis of an ectopic or intrauterine pregnancy. (medscape.com)
There are strips which serve different purposes, such as qualitative strips that only determine if the sample is positive or negative, or there are semi-quantitative ones that in addition to providing a positive or negative reaction also provide an estimation of a quantitative result, in the latter the colour reactions are approximately proportional to the concentration of the substance being tested for in the sample. (wikipedia.org)

56), "Oxidizing agents such as hypochlorite and ascorbic acid cause false-negative reactions for blood on the urine dipstick," cannot be answered true or false. (thefreedictionary.com)
3] False-negative reactions for both blood and sugar are a major problem if there is ascorbic acid in the urine. (thefreedictionary.com)

Then comes rolling reaction #3, and that is when they called 911 (that's right, the allergy doctor had to call for the EMS! (healingwell.com)
Therefore, in cases of apparent reactions to cosmetics and of eczema ani, allergy to methyldibromoglutaronitrile should be suspected. (unboundmedicine.com)

Have resusitation equipment available, as there is a theoretic risk of a severe reaction. (allergyweb.com)

Since few published studies of individual dipstick performance have included checks for urinary ascorbate, unsuspected urinary contamination with vitamin C may have been responsible for some of the false-negative reactions for hemoglobin and glucose noticed in earlier dipstick evaluations. (thefreedictionary.com)

Samples positive by CAP/CTM but negative by Amplicor displayed poor amplification curves compared to concordant positive samples. (worldwidescience.org)

It's not too common to be negative to both tests. (healingwell.com)
My RAST tests are negative, however a couple of my skin tests have been both positive and negative. (healingwell.com)
Tests based on interferon- (IFN-) expression in or other infections often have false-negative reactions ( 7 ). (cdc.gov)
However, the TST may stimulate the immune system, causing a positive, or boosted reaction to subsequent tests. (uintacounty.com)
May suppress reactions to skin tests. (empr.com)
RAST tests can give a false negative. (peanutallergy.com)
In Canada, true negative tests are certainly plausible during the spring season. (cfp.ca)
When somebody tests positive for COVID here at the Kennedy Space Center and across NASA, it is our policy for that person to quarantine and self-isolate, so we anticipate that that will be taking place," NASA Administrator Jim Bridenstine said during a news conference today when asked about tweets in which Musk said he had received both positive and negative tests . (space.com)
Two tests came back negative, two came back positive. (space.com)

if your son hasn't been exposed all these years, his RAST might show a false negative. (peanutallergy.com)
i have a false negative for my latex RAST levels, but a super positive skin/respiratory reaction. (peanutallergy.com)

Briefly, 1 mL of blood was drawn culture (Becton Dickinson, Sparks, MD, USA) were con- into vacutainer (Becton Dickinson) tubes coated with either ducted by trained staff at Zankli TB Research Laboratory saline (negative control tube) or ESAT-6, CFP-10, and TB in Abuja. (cdc.gov)

Contralateral inguinal hernia after negative laparoscopic evaluation: a rare but real phenomenon. (childrensmercy.org)

Since all adults enrolled in the study trifuged, and the supernatant plasma was harvested and had positive cultures, they were classified as having stored at -80°C until transported to Hvidovre Hospital in smear-positive or smear-negative TB. (cdc.gov)

Although jurisdictions in other countries have cited varying false-negative rates, some as high as 50%, 4 provincial systems, such as Alberta's laboratory testing process, have yielded 100% accuracy, as confirmatory testing by Canada's National Microbiology Laboratory has shown. (cfp.ca)

an erroneous or mistakenly negative response. (thefreedictionary.com)

False Negative Reactions" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (sickkids.ca)

Persons showing positive tuberculin reactions should be considered positive by current public health guidelines and referred for further medical evaluation. (drugs.com)
and TST positive, QFT-IT nega- for improving management of children at high risk, most tive if in contact with TB-negative persons or controls. (cdc.gov)

The compounds responsible for the reaction were named schaefferal A and B to honor Schäffer. (wikipedia.org)

Thrombosis and subsequent recanalization of a ruptured intracranial aneurysm in 2 children, demonstrating the value of repeating catheter angiography after an initial negative study. (biomedsearch.com)

Carbapenemase-producing organisms (CPOs) are Gram-negative bacteria that are typically resistant to most or all antibiotics and are responsible for a global pandemic of high mortality. (bioportfolio.com)

Analytical, Diagnostic and Therapeutic Techniques and Equipment9

Phenomena and Processes2

Anthropology, Education, Sociology and Social Phenomena1

Information Science1

Health Care5

Rational sequence of tests for pancreatic function. (1/1867)

Abnormal responses to rubella infection. (2/1867)

Intimal tear without hematoma: an important variant of aortic dissection that can elude current imaging techniques. (3/1867)

Comparison of standard and CA-125 response criteria in patients with epithelial ovarian cancer treated with platinum or paclitaxel. (4/1867)

Recycling, channeling and heterogeneous protein turnover estimation using a model of whole-body protein turnover based on leucine kinetics in rodents. (5/1867)

HLA-B27 antigen in diagnosis of atypical seronegative inflammatory arthropathy. (6/1867)

Radioactive phosphorus uptake testing of choroidal lesions. A report of two false-negative tests. (7/1867)

An approach to the problems of diagnosing and treating adult smear-negative pulmonary tuberculosis in high-HIV-prevalence settings in sub-Saharan Africa. (8/1867)

False Negative Reactions

Bacteriological Techniques

Evaluation Studies as Topic

False Positive Reactions

Sensitivity and Specificity

Diagnostic Errors

Reproducibility of Results

Frozen Sections

Predictive Value of Tests

Algorithms

Embalming

Dictionaries, Medical

Dictionaries as Topic

Cellular Phone

Dictionaries, Chemical

Thyroid Neoplasms

Adenocarcinoma, Follicular

Carcinoma, Papillary

Iodine Radioisotopes

Thyroidectomy

Fluorodeoxyglucose F18

Drug Monitoring

Tuberculin

Tuberculin Test

Universal Precautions

BCG Vaccine

Practice Guidelines as Topic

Tuberculosis

Tomography, Spiral Computed

Tomography, X-Ray Computed

Tomography Scanners, X-Ray Computed

Lung Neoplasms

Lung

Carcinoma, Non-Small-Cell Lung

Positron-Emission Tomography

Brain Injuries

Post-Concussion Syndrome

Brain Concussion

Diffuse Axonal Injury

Brain Injury, Chronic

Blast Injuries

Glasgow Coma Scale

Intracranial Aneurysm

Subarachnoid Hemorrhage

Vasospasm, Intracranial

Aneurysm

Aneurysm, Ruptured

Cerebral Angiography

Embolization, Therapeutic

Vision Tests

Ethiopia

Visual Acuity

Visual Fields

Visual Field Tests

Glaucoma, Open-Angle

Glaucoma

Rational sequence of tests for pancreatic function. (1/1867)

Abnormal responses to rubella infection. (2/1867)

Intimal tear without hematoma: an important variant of aortic dissection that can elude current imaging techniques. (3/1867)

Comparison of standard and CA-125 response criteria in patients with epithelial ovarian cancer treated with platinum or paclitaxel. (4/1867)

Recycling, channeling and heterogeneous protein turnover estimation using a model of whole-body protein turnover based on leucine kinetics in rodents. (5/1867)

HLA-B27 antigen in diagnosis of atypical seronegative inflammatory arthropathy. (6/1867)

Radioactive phosphorus uptake testing of choroidal lesions. A report of two false-negative tests. (7/1867)

An approach to the problems of diagnosing and treating adult smear-negative pulmonary tuberculosis in high-HIV-prevalence settings in sub-Saharan Africa. (8/1867)

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