HIV SeropositivityHIV SeroprevalenceHIV InfectionsSubstance Abuse, IntravenousSexual BehaviorRisk FactorsBibliometricsJournal Impact FactorSeroepidemiologic StudiesPeriodicals as TopicPublicationsPublishingDatabases, BibliographicMEDLINEAuthorshipAbstracting and Indexing as TopicPubMedMedical Subject HeadingsBibliography as TopicAntibodies, ViralPeer Review, ResearchAntibodies, BacterialChlamydophila pneumoniaeChlamydophila InfectionsImmunoglobulin GBiomedical ResearchJournalism, MedicalSerologic TestsInformation Storage and RetrievalGovernment Publications as TopicEditorial PoliciesScienceEnzyme-Linked Immunosorbent AssayHIV SeronegativityPrevalenceReference BooksBiobibliography as TopicBooksHelicobacter pyloriEncyclopedias as TopicHelicobacter InfectionsToxocariasisPlagiarismAntibodies, ProtozoanResearch PersonnelResearchCytomegalovirus InfectionsBrazilReview Literature as TopicCross-Sectional StudiesSubject HeadingsToxoplasmosisAcquired Immunodeficiency SyndromeMEDLARSUnited StatesToxocaraHerpesvirus 2, HumanAIDS SerodiagnosisHIV-1BloggingBlood DonorsPeer ReviewNobel PrizeJournalismHepatitis CNeosporaCase-Control StudiesPapillomavirus InfectionsRandomized Controlled Trials as TopicNational Library of Medicine (U.S.)Odds RatioRetraction of Publication as TopicRural PopulationSyphilisHerpes GenitalisCytomegalovirusLibraries, MedicalAge FactorsToxoplasmaImmunoglobulin AHomosexualityCohort StudiesPhysics