HIV SeropositivityHIV InfectionsDisease ProgressionHIV SeroprevalenceCD4 Lymphocyte CountSubstance Abuse, IntravenousViral LoadHIV-1Risk FactorsSexual BehaviorAcquired Immunodeficiency SyndromeAntiretroviral Therapy, Highly ActiveAnti-HIV AgentsSeroepidemiologic StudiesHIVHIV Long-Term SurvivorsUgandaAnti-Retroviral AgentsCohort StudiesTanzaniaPregnancy Complications, InfectiousCD4-Positive T-LymphocytesInfectious Disease Transmission, VerticalRNA, ViralTreatment OutcomeTime FactorsProspective StudiesHIV SeronegativityBiological MarkersLymphocyte CountLongitudinal StudiesCD8-Positive T-LymphocytesProportional Hazards ModelsPregnancyAIDS-Related Opportunistic InfectionsSubstance-Related DisordersPrevalenceEnzyme-Linked Immunosorbent AssayAntibodies, ViralImmunoglobulin GFollow-Up StudiesAntibodies, BacterialChlamydophila pneumoniaeCross-Sectional StudiesPrognosisCase-Control StudiesChlamydophila InfectionsHepatitis CHIV Protease InhibitorsSerologic TestsRetrospective StudiesHomosexuality, MaleSurvival AnalysisAIDS SerodiagnosisCoinfectionCell CycleSouth AfricaDisease Models, AnimalHIV AntigensHIV Core Protein p24Cell Line, TumorAIDS Dementia ComplexMultivariate AnalysisAge FactorsRisk-TakingUnited StatesCytomegalovirus InfectionsHIV Wasting SyndromeReceptors, CCR5Helicobacter pyloriHelicobacter InfectionsProstatic NeoplasmsNeoplasm MetastasisIncidenceSeverity of Illness IndexHIV Envelope Protein gp120Virus ReplicationImmunohistochemistryGene Expression Regulation, NeoplasticPolymerase Chain ReactionLogistic ModelsMolecular Sequence DataCell ProliferationZidovudineGenotypeViremiaToxocariasisHerpesvirus 2, HumanSignal TransductionOdds RatioPredictive Value of TestsMutationAntibodies, ProtozoanCells, CulturedFlow CytometrySexual PartnersTumor Markers, BiologicalGB virus CAntineoplastic AgentsMice, Transgenic