SerologySerologic TestsAntibodies, BacterialEnzyme-Linked Immunosorbent AssaySeroepidemiologic StudiesAntibodies, ViralImmunoglobulin GSensitivity and SpecificityPolymerase Chain ReactionImmunoglobulin MSyphilisSyphilis SerodiagnosisPneumonia, MycoplasmaHelicobacter pyloriToxocariasisMycoplasma pneumoniaeChagas DiseaseHelicobacter InfectionsComplement Fixation TestsCeliac DiseaseTreponema pallidumChlamydophila pneumoniaeAntibodies, HelminthTrypanosoma cruziToxocaraAntibodies, ProtozoanAntigens, BacterialAgglutination TestsBartonella henselaeLeptospirosisWhooping CoughBrazilHemagglutination TestsToxocara canisTransglutaminasesEchinococcosisPrevalenceImmunoglobulin ACoxiella burnetiiFluorescent Antibody Technique, IndirectQ FeverFalse Positive ReactionsEchinococcus granulosusEvaluation Studies as TopicLeptospiraChlamydophila InfectionsChlamydia InfectionsDiet, Gluten-FreeSerotypingBrucellosisReagent Kits, DiagnosticLeishmania infantumParasitologyCytomegalovirus InfectionsLymphogranuloma VenereumBreath TestsBiopsyBordetella pertussisVirologyEchinococcosis, HepaticBacteriological TechniquesImmunoenzyme TechniquesDisease OutbreaksHerpes GenitalisCross ReactionsHerpesvirus 2, HumanChagas CardiomyopathyDog DiseasesGliadinHepatitis BProspective StudiesAntigens, ViralLyme DiseaseArgentinaBlood DonorsHepatitis B AntibodiesInfant, NewbornStrongyloidiasisUlcerBartonella InfectionsCoccidioidomycosisLeptospira interrogans serovar pomonaImmunoassayToxoplasmosisCentral Nervous System HelminthiasisEchinococcosis, PulmonaryInfectious MononucleosisFluorescent Antibody TechniqueDNA, ViralGastritis, AtrophicRetrospective StudiesPsittacosisImmunologic TestsCytomegalovirusLeishmaniasis, VisceralDyspepsiaGastroscopyDithioerythritolRisk FactorsParvovirus B19, Human