Seroepidemiologic StudiesHIV SeropositivityAntibodies, ViralHIV SeronegativitySerologic TestsEnzyme-Linked Immunosorbent AssayCytomegalovirus InfectionsHerpesvirus 2, HumanHIV InfectionsHIV-1Antibodies, BacterialAcquired Immunodeficiency SyndromeCytomegalovirusImmunoglobulin GHerpes GenitalisRheumatoid FactorAntibodies, ProtozoanNeosporaHomosexualityVirus SheddingPolymerase Chain ReactionArthritis, RheumatoidBlood DonorsAIDS-Related ComplexPrevalenceDog DiseasesDNA, ViralHerpesviridae InfectionsPregnancy Complications, InfectiousInfectious Disease Transmission, VerticalRisk FactorsHIV SeroprevalenceCoccidiosisToxoplasmaToxocariasisImmunoglobulin MAIDS-Related Opportunistic InfectionsToxoplasmosisAntigens, ViralHIV AntibodiesTrypanosoma cruziAsymptomatic InfectionsDisease ReservoirsLeishmania infantumZoonosesCD4 Lymphocyte CountAnimals, WildBrazilChagas DiseaseHIVGoat DiseasesCattle DiseasesToxocara canisHTLV-I InfectionsHerpes SimplexHemophilia AAnimals, ZooAcyclovirAntibodies, HelminthCohort StudiesHerpesvirus 8, HumanHTLV-I AntibodiesPregnancyEhrlichiosisHantavirus InfectionsRheumatoid NoduleVaginaSensitivity and SpecificityImmunoglobulin AViral LoadChlamydophila pneumoniaeCase-Control StudiesHIV AntigensQ FeverGoatsToxoplasmosis, AnimalHelicobacter pyloriCross-Sectional StudiesProspective StudiesRodent DiseasesLeishmaniasis, VisceralSexual BehaviorParvoviridae InfectionsCarrier StateHorse DiseasesHerpesvirus 4, HumanHelicobacter InfectionsInfant, NewbornDeltaretrovirus AntibodiesChagas CardiomyopathyRNA, ViralEndemic DiseasesHepatitis CAutoantibodiesTime FactorsToxocaraVirus ActivationHomosexuality, MaleCysticercosisSheep Diseases