HIV SeropositivityHIV SeroprevalenceHIV InfectionsSubstance Abuse, IntravenousSexual BehaviorRisk FactorsDisease ProgressionSeroepidemiologic StudiesCell DeathCause of DeathAntibodies, ViralAntibodies, BacterialChlamydophila pneumoniaeImmunoglobulin GChlamydophila InfectionsDeathEnzyme-Linked Immunosorbent AssaySerologic TestsHIV SeronegativityPrevalenceHelicobacter pyloriHelicobacter InfectionsAcquired Immunodeficiency SyndromeToxocariasisTime FactorsHIV-1Cohort StudiesAntibodies, ProtozoanCytomegalovirus InfectionsProspective StudiesCross-Sectional StudiesCase-Control StudiesToxoplasmosisAge FactorsFollow-Up StudiesHepatitis CHerpesvirus 2, HumanToxocaraAIDS SerodiagnosisDeath, Sudden, CardiacBlood DonorsPapillomavirus InfectionsRetrospective StudiesCD4 Lymphocyte CountRural PopulationCell CycleNeosporaBrazilOdds RatioCell Line, TumorCytomegalovirusTreatment OutcomeIncidenceBrain DeathHerpes GenitalisSyphilisImmunoglobulin AMultivariate AnalysisToxoplasmaHuman papillomavirus 16HomosexualityPrognosisImmunoglobulin MApoptosisAnti-HIV AgentsHomosexuality, MaleHepatitis A Virus, Human