Serologic TestsSensitivity and SpecificityNeuromuscular Junction DiseasesTomography, X-Ray ComputedPhysical ExaminationMedical History TakingRetrospective StudiesMagnetic Resonance ImagingBiopsyPredictive Value of TestsProspective StudiesReproducibility of ResultsOccult BloodMass ScreeningSyphilis SerodiagnosisEarly DiagnosisAgglutination TestsComplement Fixation TestsPractice Guidelines as TopicEnzyme-Linked Immunosorbent AssayBrucellosis, BovineAntibodies, BacterialRisk FactorsReferral and ConsultationInfant, NewbornFollow-Up StudiesRadiopharmaceuticalsSyphilisAcute DiseasePrevalenceHemagglutination TestsTime FactorsUnited StatesTreatment OutcomeBiological MarkersBrucellosisReagent Kits, DiagnosticAlgorithmsChronic DiseaseFlocculation TestsAge FactorsPrognosisCohort StudiesFalse Positive ReactionsRose BengalBrucellaImmunoglobulin MBrainImmunoglobulin GEvaluation Studies as TopicChagas DiseaseDiagnostic ErrorsAntigens, BacterialDiagnostic Tests, RoutineSyphilis, CongenitalTreponemal InfectionsAntibodies, ProtozoanDiagnostic Techniques and ProceduresCounterimmunoelectrophoresisTreponema Immobilization TestAntibodies, ViralImmunodiffusionTrypanosoma cruziDiagnostic ImagingFluorescent Antibody TechniquePolymerase Chain ReactionImmunologic TestsLatex Fixation TestsClinical Laboratory TechniquesCross ReactionsSeroepidemiologic StudiesBrucella abortusLyme DiseaseParasitologyTreponema pallidumAntibodies, HelminthROC CurveImmunoglobulin ACoccidioidomycosisLeishmaniasis, VisceralReaginsBrucella melitensisImmunoassayMustelidaeAntibodies, FungalCattle DiseasesImmunoenzyme TechniquesWeil DiseaseDog DiseasesFluorescent Antibody Technique, IndirectNeurosyphilisLeptospirosisToxoplasmosisCat-Scratch DiseaseAntigens, ProtozoanBrazilHelicobacter pyloriBartonella henselaeCeliac DiseaseAbortion, Veterinary