SerologySerologic TestsAntibodies, BacterialSensitivity and SpecificityEnzyme-Linked Immunosorbent AssaySeroepidemiologic StudiesAntibodies, ViralImmunoglobulin GPolymerase Chain ReactionImmunoglobulin MSyphilisHelicobacter pyloriSyphilis SerodiagnosisPneumonia, MycoplasmaHelicobacter InfectionsToxocariasisMycoplasma pneumoniaeChagas DiseaseComplement Fixation TestsCeliac DiseaseProspective StudiesTreponema pallidumAntibodies, HelminthChlamydophila pneumoniaePrevalenceTrypanosoma cruziToxocaraRetrospective StudiesAntibodies, ProtozoanReproducibility of ResultsAntigens, BacterialBrazilAgglutination TestsTreatment OutcomeTime FactorsEvaluation Studies as TopicBartonella henselaeFalse Positive ReactionsLeptospirosisWhooping CoughHemagglutination TestsImmunoglobulin ATransglutaminasesToxocara canisFluorescent Antibody Technique, IndirectEchinococcosisRisk FactorsCoxiella burnetiiInfant, NewbornCase-Control StudiesQ FeverReagent Kits, DiagnosticEchinococcus granulosusBiopsyPredictive Value of TestsLeptospiraSerotypingChlamydia InfectionsBrucellosisBreath TestsParasitologyFollow-Up StudiesChlamydophila InfectionsDiet, Gluten-FreeImmunoenzyme TechniquesLeishmania infantumBacteriological TechniquesDisease OutbreaksPregnancyDog DiseasesVirologyCytomegalovirus InfectionsImmunoassayLymphogranuloma VenereumCross ReactionsBordetella pertussisHerpes GenitalisHerpesvirus 2, HumanCohort StudiesEchinococcosis, HepaticChagas CardiomyopathyHepatitis BArgentinaAntigens, ViralCross-Sectional StudiesLyme DiseaseGliadinBlood DonorsFluorescent Antibody TechniqueDNA, ViralHepatitis B AntibodiesDyspepsiaDNA, BacterialUlcerImmunologic TestsToxoplasmosisGastroscopyStrongyloidiasisGastritis, AtrophicBartonella Infections