Abstract Gymnophalloides seoi (Digenea: Gymnophallidae), a new human intestinal trematode reported from a Korean woman who complained of epigastric discomfort, has been shown to be highly prevalent among the villagers of a southwestern island of the Republic of Korea. For the detection of human infections, fecal examinations were conducted on the inhabitants of a seashore village, where the first patient with a G. seoi infection had resided. Of 98 inhabitants examined, 70 (71.4%) were infected with various intestinal parasites; among them, G. seoi showed the highest rate of egg positivity 48 of 98 (49.0%). Individual worm burdens of G. seoi, as measured by collection of adult flukes after anthelmintic treatment and purgation, ranged from 106 to 26,373 specimens (average per infected case = 3,326). There was no sex-related difference in the prevalence of G. seoi, and the age distribution of the infected cases showed a relatively even pattern. This study confirms that human infection by G. seoi is not an
Nearly every species on the planet has at least one parasite, which, by definition, incurs a cost in the host. Therefore, organisms must resist parasites - preventing or reducing infections - or tolerate parasites - reducing the costs of infection - in order to maintain their fitness despite the presence of parasites. Here, I investigated: 1) whether parasitic, larval trematodes (cercariae) can detect the least resistant tadpole host species, 2) a hypothetical framework for how host life history impacts the utilization of inflammation and thus, resistance and tolerance, 3) whether a common anesthesia technique used in experimental infections immunocompromises tadpoles, 4) the relationship between tadpole host life history, tolerance, and behavioral resistance to cercarial infection, 5) how tadpole behavior affects trematode infection location, and 6) how host life history impacts trematode infection location and the implications of this for host tolerance. In the first chapter, I investigated whether
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Microphallus piriformes is a parasitic trematode (fluke). It belongs to the Plagiorchiata, a large suborder of the digenean fluke order Plagiorchiida. M. piriformes is unusual among the flukes in having only one intermediate host rather than two, and no free-swimming cercarian stage. It is most notable, however, for modifying the behaviour of its intermediate host in a way that increases its chance of transmission to the primary host. This has been researched by Helen O. McCarthy and her team of University of Ulster scientists both in the laboratory and at Muck Island in Scotland. The life cycle of M. piriformes requires two hosts: the rough periwinkle Littorina saxatilis (a littoral snail) and the herring gull Larus argentatus (and perhaps other members of the herring gull complex). The immature flukes live in the snail, and the adult flukes live in the bird. Normally, rough periwinkles are rarely eaten by herring gulls. This is due to two reasons: First, the birds forage in the snails rocky ...
Toxicity of cadmium and zinc mixtures to Diplostomum spathaceum (Trematoda : Diplostomidae) cercarial survival. / Morley, N. J.; Crane, M.; Lewis, J. W.. In: Archives of Environmental Contamination and Toxicology, Vol. 43, No. 1, 02.07.2002, p. 28-33.. Research output: Contribution to journal › Article ...
Allocreadium handiai (Dhaka). A. mymensinghi (Dhaka). Aphallus sp. (Dhaka). Clinostomum complanatum metacercaria (Dhaka). Clinostomum sp. metacercaria (Dhaka). Euclinostomum multicaecum metacercaria (Dhaka). Euclinostomum sp. metacercaria (Dhaka). Eumasenia sp. (Dhaka?, Sylhet?). Genarchopsis bashiri (Dhaka). Macrolecithus sp. (Dhaka?, Sylhet?). ?Macvicaria crassigula (Dhaka). Neopecoelina saharanpuriensis (Barisal, Dhaka, Sylhet?). Neopecoelina sp. (Barisal, Dhaka, Sylhet?). Opegaster beliyai (Dhaka). Orientocreadium batrachoides (Dhaka). Palaeorchis sp. (Barisal, Dhaka). Philopinna sp. (Dhaka). Digenea gen. sp. (Chittagong) ...
Clinostomum marginatum is a species of parasitic flukes (class Trematoda). It is commonly called the "yellow grub". It is found in many freshwater fish in North America, and no fish, so far is immune to this parasite. This type of fluke can be found in the mouth of aquatic birds such as herons and egrets. They are also found commonly in the esophagus of fish-eating birds, and reptiles. Eggs of these trematodes are shed in the feces, hopefully into the water. Many aquatic birds become infected by ingesting freshwater fish that are infected. The metacercariae are found right beneath the skin or in the muscles. Life cycle of this "yellow grub" consists of two intermediate hosts and one definitive host. The parasites eggs hatch in the water and the miracidium invades the foot of the snails. The cercaria leaves the snail and encysts in the muscle of the connective tissue of fresh-water species. The metacercarial stage is that is formed is then referred to as the "yellow grub". The encysted ...
A high prevalence of vertebral deformities has been observed in various fishes, especially cyprinids, from certain regions of the Willamette River for many years. One proposed source of these deformities is exposure to toxicants. Histological evaluation of affected chiselmouth Acrocheilus alutaceus revealed that all lesions associated with vertebrae were associated with metacercariae of digenean trematodes. Approximately half of the northern pikeminnow Ptychocheilus oregonensis had infections in which metacercariae were associated with these lesions. Metacercariae were also associated with vertebral lesions in three of four affected peamouth Mylocheilus caurinus. Many metacercariae that were present within the vertebral bodies were associated with bony dysplasia and bony proliferation in all three species. We also evaluated the association of the metacercariae with the vertebral deformities, using intact fish that had been cleared with trypsin. Fish from the affected regions had a much higher ...
Microphallus, defined as a functionally normal penis, including a penile urethra, with a stretched length less than two standard deviations, can be caused by a variety of diseases and conditions.
Microphallus, or micropenis, is defined as a stretched penile length of less than 2.5 standard deviations (SDs) below the mean for age.
While A. contortum seems to do quite well in its rather unusual (for a trematode) habitat, the basic body plan for trematode is that of an internal parasite. So how does one modify a body plan for living inside the cosy confine of a hosts body to a life clinging on to the more exposed parts of the host? Fortunately for A. contortum there are some functional overlaps between living in a fishs intestine versus living on its gills. While it lacks the hooks and sucker clamps of monogenean flatworms which are specialised for ectoparasitism, A. contortum has co-opted its large and muscular ventral sucker for hanging on to the sunfishs gills. Other trematode species use their ventral sucker to attach to the intestinal wall. In A. contortum it also function as the main attachment organ, but on a different part of the hosts body. Additionally, this flukes hind body appears to be long and prehensile, which it might to able to use to grip like a chameleons tail (to a limited degree ...
We identified 7584 pairs of one-to-one orthologous transcripts between the two transcriptomes (see Table S2) and 7851 and 21,980 nonone-to-one orthologous transcripts for PA-Microphallus and PE-Microphallus, respectively. The two one-to-one ortholog transcriptomes contain higher mean transcript lengths (18.6% longer for PA-Microphallus; 38.7% longer for PE-Microphallus) and larger N50 values (11.7% greater N50 for PA-Microphallus; 33.9% greater N50 for PE-Microphallus) than their corresponding reference transcriptomes (Table 1). The longer transcripts and higher N50 values in the one-to-one ortholog sets relative to the reference transcriptomes indicate that the one-to-one orthologs represent a set of approximately full-length high quality genes that occur once and only once in both transcriptome assemblies. More than half (PA-Microphallus: 51.7%; PE-Microphallus: 51.2%) of the BUSCO genes are retained in this reduced gene set, further indicating that our filtering steps likely removed poor ...
The purpose of this thesis is to obtain an understanding of parasite ecology and the incidence of black spot disease in freshwater fish. Parasite morphology, transmission, and life cycles are important to understand before being able to control a parasite. Uvulifer ambloplitis is a larval trematode worm that infects freshwater fish and causes a black pigment to be produced in response to its metacercariae stage. Other immune responses and effects on the intermediate hosts, fish and snails, are examined. A study was done on the fish of Rutledge Creek, Virginia to take a closer look at the epidemiology of this parasite. A flourishing parasite community at Rutledge Creek can be an indicator of good stream health and quality. Typically, the prevention and control of trematode parasites focuses on molluscicidal chemicals and plants.
Photo 2. Adult Metagonimus yokagawai. This is the most common heterophyid fluke of the Far East but is also found in the Mediterranean basin. The life cycle is similar to that of Heterophyes and the eggs of the two species can only be separated with difficulty. The adult worm shown here is also very small (1.4 x 0.6 mm) and lives in the upper and middle jejunum. Several genera of snails including Semisulcospira (see Table XI) are the first intermediate hosts for the species; the cercariae encyst on fish. (x35). ...
DE CARVALHO, Gílcia A.; UETA, Marlene T. e DE ANDRADE, Carlos F. S.. Search of natural occurrence of xiphidiocercariae (Trematoda) in fresh water snails of nine counties from São Paulo State, Brazil. Bol. chil. parasitol. [online]. 2001, vol.56, n.1-2, pp.3-9. ISSN 0365-9402. http://dx.doi.org/10.4067/S0365-94022001000100003.. Xiphidiocercariae, aquatic larval stages of some trematodes are considered a potential instrument for biological control of mosquitoes. In this study we evaluated its natural occurrence in Campinas region and two places in Vale do Ribeira (Registro and Miracatu), São Paulo State. Snails were obtained from fresh water collections from September 1996 to February 1999. The species collected were Lymnaea columella, Physa marmorata, Biomphalaria tenagophila, Biomphalaria sp., Drepanotrema cimex, D. lucidum and Drepanotrema sp. Fasciola hepatica, xiphidiocercariae (Haematoloechidae) and echinostomatid cercariae were detected in the lymnaeids snails from Miracatu, SP. In the ...
Life cycle stages of Glypthelmins pennsylvaniensis. A. Egg with miricidium. B. Hatched eggs. Note operculum. C. Sporocyst. D. Cercaria. E. Cercaria penetrating the tail of a Pseudacris triseriata tadpole. F. Two cercariae migrating in the tissue of the tail of a tadpole of P. triseriata. G. Formed metacercaria in the tail of a tadpole of P. triseriata. H. Twelve day old metacercaria from the tissue of a P. triseriata tadpole. I. Cercaria attached to a tadpole of Rana blairi. J. Close up of J. K. Metacercaria in the tail of a R. blairi tadpole. L. Cercaria penetrating the tail of Bufo woodhousii tadpole. ...
Heres Lepidapedon, a lepocreadiid digenean. Lepocreadiids are very common in marine fishes and are almost a prototypical digenean; they have oral and ventral suckers, two testes (the big medial blue blobs), one ovary (darker blue blob in front), a lot of cortical vitelline follicles for making egg shells (the brown blobs all round the outside) and a lightly spiny tegument, which probably aids them in holding onto the intestinal mucosa of their teleost fish hosts. Like all digeneans, they have complex life cycles involving a mollusk first intermediate host, but in most cases, including this one, that host is not known. After the mollusk comes a crustacean of some sort, again unknown in this case, which is actively penetrated by the cercarial stage that emerges from the mollusk. The definitive fish host becomes infected by eating the crustacean. This Lepidapedon is from the intestine of the butterfish, Peprilus triacanthus, a common midwater schooling fish on the Atlantic coast ...
Read, Clark P., 1921-1973. "Part 1: The life history and morphology of Rhopalias Macracanthus Chandler (Trematoda) Part 2: Studies of North American helminths of the capillaria Zeder, 1800 (Nematoda)." (1948) Masters, Rice University. http://hdl.handle.net/1911/89589 ...
Development of Halipegus eccentricus cistophorus cercaria in an experimentally infected Physa gyrina snail first intermediate host. Note the emergence of the cercaria body through the delivery tube (E-I).. ...
Bakker, K. E. and Davids, C. (1973). Notes on the life history of Aspidogaster conchicola Baer, 1826 (Trematoda; Aspidogastridae). Journal of Helminthology 47, 269-276.. Ferguson, M. A., Cribb, T.H. and Smales,,L.R. (1999). Life cycle and biology of Sychnocotyle khola n.g., n.sp. (Trematoda, Aspidogastrea) in Emydura macquarii (Pleurodira: Chelidae) from southern Queensland, Australia. Systematic Parasitology 43, 41-48.. Huehner, M. K. and Etges, F. J. (1972a). Experimental transmission of Aspidogaster conchicola von Baer, 1827. Journal of Parasitology 58, 109.. Huehner, M. K. and Etges, F. J. (1977). The life cycle and development of Aspidogaster conchicola in the snails, Viviparus malleatus and Goniobasis livescens. Journal of Parasitology 63, 669-674.. Huehner, M. K. and Etges, F. J. (1981). Encapsulation of Aspidogaster conchicola (Trematoda: Aspidogastrea) by unionid mussels. Journal of Invertebrate Pathology 37, 123-128.. Rohde, K. (1972). The Aspidogastrea, especially Multicotyle purvisi ...
Bakker, K. E. and Davids, C. (1973). Notes on the life history of Aspidogaster conchicola Baer, 1826 (Trematoda; Aspidogastridae). Journal of Helminthology 47, 269-276.. Ferguson, M. A., Cribb, T.H. and Smales,,L.R. (1999). Life cycle and biology of Sychnocotyle khola n.g., n.sp. (Trematoda, Aspidogastrea) in Emydura macquarii (Pleurodira: Chelidae) from southern Queensland, Australia. Systematic Parasitology 43, 41-48.. Huehner, M. K. and Etges, F. J. (1972a). Experimental transmission of Aspidogaster conchicola von Baer, 1827. Journal of Parasitology 58, 109.. Huehner, M. K. and Etges, F. J. (1977). The life cycle and development of Aspidogaster conchicola in the snails, Viviparus malleatus and Goniobasis livescens. Journal of Parasitology 63, 669-674.. Huehner, M. K. and Etges, F. J. (1981). Encapsulation of Aspidogaster conchicola (Trematoda: Aspidogastrea) by unionid mussels. Journal of Invertebrate Pathology 37, 123-128.. Rohde, K. (1972). The Aspidogastrea, especially Multicotyle purvisi ...
My research interests are in the broad area of parasite ecology. Ecology is the study of interactions of organisms with each other and with their environment. A parasites lives on, or in, a living host during some part of its life. A host, therefore, is both another organism and the parasites environment. Consequently, there are many fascinating ecological questions to be addressed surrounding host-parasite relationships. Both hosts and parasites vary widely in their biological characteristics. Some parasites have complex life cycles involving multiple hosts while others have direct life cycles. In any case, one of the main challenges to success as a parasite is successful transmission of offspring into new hosts. I am interested in how various aspects of host and parasite biology, as well as environmental factors, interact to structure parasite assemblages in host individuals, populations, and communities. This has led me to work with communities of larval trematodes in freshwater snails and ...
Two species of Coitocaecum Nicoll, 1915, C. gymnophallum Nicoll, 1915 and C. michaeli n. sp., are recorded, described and figured from the intestine of Acanthopagrus australis from Moreton Bay, off south east Queensland. The holotype of C. gymnophallum Nicoll, 1915 is examined, measured and figured for comparison. C. glandulosum Yamaguti, 1934 and C. robustum Wang, 1984 are reduced to synonymy with C. gymnophallum. The host specificity of Coitocaecum spp. is discussed ...
Adults inhabit ponds, streams and rivers, preferring stagnant and muddy water of plains (Ref. 41236). Found mainly in swamps, but also occurs in the lowland rivers. More common in relatively deep (1-2 m), still water. Very common in freshwater plains (Ref. 4515, 57235). Occur in medium to large rivers, brooks, flooded fields and stagnant waters including sluggish flowing canals (Ref. 12975). Survive dry season by burrowing in bottom mud of lakes, canals and swamps as long as skin and air-breathing apparatus remain moist (Ref. 2686) and subsists on the stored fat (Ref. 1479). Feed on fish, frogs, snakes, insects, earthworms, tadpoles (Ref. 1479) and crustaceans (Ref. 2847). Undertake lateral migration from the Mekong mainstream, or other permanent water bodies, to flooded areas during the flood season and return to the permanent water bodies at the onset of the dry season (Ref. 37770). During winter and dry season, its flesh around coelomic cavity is heavily infested by a larval trematode ...
WoRMS (2018). Contracaecum spiculigerum (Rudolphi, 1809). Accessed at: http://marinespecies.org/aphia.php?p=taxdetails&id=527915 on 2018-03-23 ...
Ascocotyle minuta Looss, 1899. ETYMOLOGY:Ascos (tube) + cotyle (disk) [referring to the shape of the anterior sucker being elongated within the body] and minuta (small) [referring to the small size].. SYNONYMS:Phagicola minuta (Looss, 1899) Faust, 1920; Parascocotyle minuta (Looss, 1899) Stunkard and Haviland 1924.. HISTORY: This parasite was originally described from dogs and cats in Egypt; it was also found at this time in a heron Ardea cinerea.. GEOGRAPHIC DISTRIBUTION: Egypt.. LOCATION IN HOST: Small intestine.. PARASITE IDENTIFICATION: This small fluke is less than 0.5 mm in length. The oral sucker bears approximately 18 to 20 hooklets and leads into the conical prepharynx that is characteristic of this genus. The genital opening is just anterior to the ventral sucker. Most of the reproductive organs are posterior to the ventral sucker. The paired testes are symmetrical and located at the posterior end of the body.. The eggs have a golden brown shell and are 23 to 24 µm long by 14 µm in ...
The Capsalidae are monogeneans parasitizing skin, fins and gills of marine fishes. Some capsalids are pathogenic to cultivated fish and a few have caused epizootic events. It is a cosmopolitan family with broad host associations (elasmobranc...
Appendix A. Literature review for Littorina littorea (LL), L. saxatilis (LS), and L. obtusata (LO) documenting sample sizes and trematode species richness by site.. TABLE A1. For North America, sites are listed north to south. For Europe, sites are listed NW to SE (with the exceptions of Iceland sites, which are placed before Scandinavian sites, and United Kingdom sites, which are binned by country and then listed north to south). Following this are the number of snails sampled for each study, the number of infected snails for each study, the total species richness in the study, and the adjusted species richness (average + standard deviation) per site. Adjusted species richness is based upon Monte Carlo resampling standardized for sampling effort at 75 individuals (sites with less than 75 individuals are represented by an asterisk). The abbreviation n.d. indicates no data. References are presented below.. ...
The research includes the species identification of the developmental forms of trematodes by molecular methods. Most are flattened and leaflike or ribbonlike, although some are stout and circular in cross section.
Gurevitch, J., and L. V. Hedges. 1993. Meta-analysis: combining the results of independent experiments. Pp. 378-398 in S. M.Scheiner and J.Gurevitch, eds. Design and analysis of ecological experiments. Chapman & Hall, New York ...
A phenomenon of switching of the parasite in the food chain to an accidental host is commonly observed in nature. However, there is little available data concerning the morphological descriptions of parasites that passively get into the atypical hosts and are capable, at least to some degree, of somatic growth and development of reproductive structures. A morphological survey of Diplodiscus subclavatus (Pallas, 1760) adults isolated from a digestive tract of an accidental host, Viviparus contectus (Millet, 1813), was carried out. Diplodiscus subclavatus individuals identified in prosobranch snails were morphologically similar to adult forms of the parasite described from amphibians, typical final hosts in the life cycle of this paramphistomid. The observed forms of D. subclavatus had a fully developed reproductive system, sperm in the seminal vesicle and oocytes in the ovary. The number of eggs in the uterus ranged from 3 to 17. Our research indicates that D. subclavatus individuals reach the ...
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Salgado-Maldonado et al. 2005 a).. Specimens in collections: CNHE (4120 - 1); IPCAS (C - 281); USNPC (88229, 90350).. Birds (A): Intestine.. VERACRUZ: Lago El Bayo: Ardea alba ( Ortega-Olivares et al. 2008) ...
Zdzitowiecki, K. (1990). Antarctic representatives of the genus Macvicaria Gibson & Bray, 1982 (Digenea Opecoelidae), with descriptions of two new species. Systematic Parasitology. 16(3): 169-179 ...
Ultrastructure of mature spermatozoon of Anisocoelium capitellatumis described with transmission electron microscopy. The description gave evidence of some characteristics of this digenean. The male...
Alaria RX is a natural age defying cream, which claims to provide you a soft and aging free skin along with the assurance of quick results.
Larva alebo larválne štádium je nedospelé vývinové štádium živočíchov, ktoré sa buď postupným zvliekaním (nedokonalá premena) alebo prostredníctvom kukly (dokonalá premena) zmení na dospelého jedinca. Na rozdiel od mláďat sú larvy často anatomicky a morfologicky značne odlišné od dospelých jedincov. U hmyzu s dokonalou premenou nemá vonkajšie znaky imága (napr. u motýľa ide o húsenicu). Posledný instar larvy sa premieňa na kuklu. Larválne štádium je súčasťou postembryonálneho vývinu jedinca. Larvy vznikajú ako výsledok pohlavného rozmnožovania, zriedkavú výnimku tvoria brvoústovce (Cycliophora), z ktorých sa nepohlavným pučaním vytvára larva pandora. Samotné larvy pohlavného rozmnožovania nie sú schopné. Niektoré larvy sa však dokážu rozmnožovať nepohlavne. Túto vlastnosť majú larvy niektorých parazitov napríklad motolíc (Trematoda). Umožňuje im tak vytvoriť obrovské množstvo infekčných štádií, čo je nevyhnutné, ...
For P. sinerae, infecting its host is not an easy task - not only does it have to find a swarm of its tiny host in the vast ocean, it also needs to make contact and accomplish what amounts to a cellular heist - the parasite needs to break through the protective shell of the alga in order to steal its valuable content. As you can imagine, during such an intense operation, being jostled around will probably throw you off your game. And indeed that is what a group of scientists in Spain have found. It appears that even a slight turbulence is enough to reduce the infection success of P. sinerae and that it performs best under calm, still conditions. These researchers suggested that turbulence would erode the zone of chemical emission around the dinoflagellate, making them more difficult to detect. Turbulence would also shorten the period of time which P. sinerae are in constant contact with the host cell - which is a necessary precondition for the parasite to perform its little cellular heist ...
Fish-borne zoonotic trematodes (FZT), such as Clonorchis sinensis, Opistorchis viverini (Opisthorchiidae) and intestinal trematodes of the family Heterophyidae, constitute a public health hazard in Vietnam and infections with these trematodes has been linked to consumption of raw or undercooked fish from aquaculture. The FZT transmission pathways, however, are more complicated than just the presence of intermediate snail hosts in aquaculture ponds as ponds may exchange water with surrounding habitats such as rice fields and irrigation canals and thereby these surrounding habitats may be a source of snails and cercariae and contribute to FZT infection in cultured fish. This is a longitudinal descriptive study on selected farms (n = 30) in Nam Dinh Province which is endemic for FZT. At each farm, we sampled one pond, a small irrigation canal used to supply the pond with water, and a nearby rice field. At each of these three sites, we estimated the density of the FZT intermediate snail hosts and determined
Intestinal trematode infections are widespread, but most common in Asia as a reflection of cultural culinary factors.Echinostomiasis and fasciolopsiasis-infection of the intestines with flukes (flatworms) of the family Echinostomatidae is acquired by the ingestion of undercooked freshwater fish, molluscs, frogs, or vegetation. Heavy infections with these worms (2-20 mm long) may cause abdominal discomfort and diarrhoea. ...
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Hagen, N.T. (1996). Parasitic castration of the green sea echinoid Strongylocentrotus droebachiensis by the nematode endoparasite Echinomermella matsi: reduced reproductive potential and reproductive death. Diseases of Aquatic Organisms, 24(3), 215-226. Retrieved from http://www.int-res.com/abstracts/dao/v24/n3 ...
This review examines the literature on imported (allochthonous) and local (autochthonous) cases of food-borne trematode (FBT) infections in the United States of America (USA) from 1890 to 2009. Most of the literature is concerned with imported cases of the opisthorchiids Clonorchis sinensis and Opisthorchis viverrini. These flukes cause serious pathology in the liver and biliary system of humans. Chronic cases may induce liver (hepatocarcinoma) and bile duct (cholangiocarcinoma) cancers in humans. Clonorchiasis and opithorchiasis are preventable diseases that can be avoided by eating properly cooked freshwater fish products. Several species of lung flukes in the genus Paragonimus are local or imported FBT in the USA. The endemic cycle occurs in the USA with various local snails and crustaceans serving as intermediate hosts. Paragonimids are acquired when humans eat raw or improperly cooked freshwater crustaceans containing metacercarial cysts. Infection can cause severe lung disease and the ...
SRAC Publication No. 410 Calculating Treatments for Ponds and Tanks. Southern Regional Aquaculture Center. https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/83/. SRAC Publication No. 475 Proliferative Gill Disease (Hamburger Gill Disease). Southern Regional Aquaculture Center. https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/122/. SRAC Publication No. 4701 Protozoan Parasites. Southern Regional Aquaculture Center. https://srac.tamu.edu/index.cfm/event/getFactSheet/whichfactsheet/171/. UF/IFAS Circular 91 Nematode (Roundworm) Infections in Fish. http://edis.ifas.ufl.edu/FA091. UF/IFAS Circular 120 Fish Health Management Considerations in Recirculating Aquaculture Systems - Part 1: Introduction and General Principles. http://edis.ifas.ufl.edu/FA099. UF/IFAS Circular 121 Fish Health Management Considerations in Recirculating Aquaculture Systems - Part 2: Pathogens. http://edis.ifas.ufl.edu/FA100. UF/IFAS Circular 122 Fish Health Management Considerations in ...
Foodborne trematodiasis is an emerging public health problem, particularly in Southeast Asia and the Western Pacific region. We summarize the complex life cycle of foodborne trematodes and discuss its contextual determinants. Currently, 601.0, 293.8, 91.1, and 79.8 million people are at risk for infection with Clonorchis sinensis, Paragonimus spp., Fasciola spp., and Opisthorchis spp., respectively. The relationship between diseases caused by trematodes and proximity of human habitation to suitable freshwater bodies is examined. Residents living near freshwater bodies have a 2.15-fold higher risk (95% confidence interval 1.38-3.36) for infections than persons living farther from the water. Exponential growth of aquaculture may be the most important risk factor for the emergence of foodborne trematodiasis. This is supported by reviewing aquaculture development in countries endemic for foodborne trematodiasis over the past 10-50 years. Future and sustainable control of foodborne trematodiasis is discussed
ABSTRACT: The digenean trematode Proctoeces maculatus is an important parasite of the blue mussel Mytilus edulis. The parasite reduces mussel quality and yield, negatively impacting mussel aquaculture efforts. Typically, the trematode is detected by visual observation. To provide a better diagnostic tool able to detect this parasite at any life stage and at low intensities, we designed a species-specific molecular assay to detect P. maculatus in M. edulis tissue. Primers targeting the 18S nuclear ribosomal DNA (rDNA) from P. maculatus were used to develop an end-point polymerase chain reaction assay and a quantitative polymerase chain reaction (qPCR) assay. Analytical specificity of the assays was demonstrated using DNA from 4 other digenean trematodes. The qPCR assay was linear from 6.79 × 102 to 6.79 × 107 copies of the cloned target DNA and had a conservative detection limit of 68 copies. The qPCR assay detected single cercariae, and the number of isolated cercariae was linearly correlated ...
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ABSTRACT. This study was carried out to establish whether cattle can develop resistance to re-infection by Calicophoron microbothrium by assessing the response of intestinal mucosal globule leukocytes, eosinophils, mast cells and basophils, and the establishment of the parasite in the host. A total of 24 1-year-old Tuli steers were randomly divided into four groups of six animals each and infected with C. microbothrium metacercariae. On the first day of the study, animals in Groups I and II were immunized with 5 000 metacercariae and then challenged with 15 000 metacercariae on Day 150 post-immunization. Animals in Group III were immunized with 15 000 metacercariae at the same time that Groups I and II animals were challenged to act as a positive control group. Animals in Group IV were left uninfected and acted as a negative control group. Three animals from each group were slaughtered on Day 28 post-challenge and the remainder were slaughtered on Day 42 post-challenge. The established ...
Forster, P. I., 1989: New host records (Family Asclepiadaceae) for Euploea core corinna (W.S. Macleay) (Lepidoptera: Nymphalidae) in Queensland