HIV InfectionsHIV SeropositivityCell DeathCause of DeathHIV SeroprevalenceHIV-1Acquired Immunodeficiency SyndromeHIV SeronegativityAnti-HIV AgentsAIDS SerodiagnosisHIVCD4 Lymphocyte CountSexual BehaviorDeathHomosexuality, MaleAnti-Retroviral AgentsRisk-TakingViral LoadRisk FactorsSubstance Abuse, IntravenousPrevalenceAIDS-Related Opportunistic InfectionsSouth AfricaAntiretroviral Therapy, Highly ActiveSexual PartnersHIV AntigensCD4-Positive T-LymphocytesAIDS Dementia ComplexZimbabweProstitutionHIV Protease InhibitorsDeath, Sudden, CardiacCondomsCohort StudiesInfectious Disease Transmission, VerticalUnited StatesHomosexualityHIV Core Protein p24Cross-Sectional StudiesUnsafe SexUgandaPregnancy Complications, InfectiousBrain DeathSyphilisIncidenceTime FactorsAfrica South of the SaharaHIV Envelope Protein gp120HeterosexualityHIV AntibodiesPregnancyMalawiCoinfectionAIDS-Related ComplexPopulation SurveillanceCounselingProspective StudiesHIV Wasting SyndromeVirus ReplicationInfant, NewbornCircumcision, MaleHealth Knowledge, Attitudes, PracticeFetal DeathReceptors, HIVSafe SexRNA, ViralReceptors, CCR5Retrospective StudiesSexually Transmitted DiseasesVoluntary ProgramsZidovudineEpidemicsTuberculosisAttitude to DeathSubstance-Related DisordersMass ScreeningHIV-2HIV Long-Term SurvivorsHIV Reverse TranscriptaseZambiaTreatment OutcomeTanzaniaFollow-Up StudiesDisease ProgressionHIV EnteropathyCells, CulturedLogistic ModelsRural PopulationIndiaAge FactorsCD8-Positive T-LymphocytesMultivariate AnalysisAntigens, CD4Hepatitis CPrisonersNeedle SharingSex WorkersCenters for Disease Control and Prevention (U.S.)Sexually Transmitted Diseases, ViralApoptosis