HIV SeropositivityHIV SeroprevalenceHIV InfectionsSubstance Abuse, IntravenousSexual BehaviorRisk FactorsDisease ProgressionSeroepidemiologic StudiesCell DeathCause of DeathAntibodies, ViralAntibodies, BacterialPrevalenceChlamydophila pneumoniaeImmunoglobulin GChlamydophila InfectionsDeathEnzyme-Linked Immunosorbent AssaySerologic TestsHIV SeronegativityTime FactorsProspective StudiesCross-Sectional StudiesFollow-Up StudiesHelicobacter pyloriHelicobacter InfectionsCohort StudiesTreatment OutcomeAcquired Immunodeficiency SyndromeAge FactorsCase-Control StudiesToxocariasisRetrospective StudiesHIV-1Antibodies, ProtozoanCytomegalovirus InfectionsQuestionnairesSeverity of Illness IndexToxoplasmosisHepatitis CHerpesvirus 2, HumanToxocaraOdds RatioIncidenceDeath, Sudden, CardiacAIDS SerodiagnosisRural PopulationBrazilBlood DonorsMultivariate AnalysisPrognosisLogistic ModelsPapillomavirus InfectionsCD4 Lymphocyte CountUnited StatesCell CycleLongitudinal StudiesNeosporaCell Line, TumorCytomegalovirusImmunoglobulin APregnancyHerpes GenitalisSex FactorsDepressionSyphilisBrain DeathHomosexualityInfant, NewbornImmunoglobulin MToxoplasmaHuman papillomavirus 16Biological MarkersSymptom AssessmentAnti-HIV AgentsHomosexuality, MaleViral LoadApoptosisHepatitis A Virus, HumanAntibodies, HelminthHepatitis ASexual Partners