HIV SeropositivityHIV SeroprevalenceHIV InfectionsSubstance Abuse, IntravenousAntiretroviral Therapy, Highly ActiveSexual BehaviorRisk FactorsAnti-HIV AgentsAnti-Retroviral AgentsSeroepidemiologic StudiesCD4 Lymphocyte CountHIV-1Viral LoadAcquired Immunodeficiency SyndromeHIV Protease InhibitorsDrug Resistance, ViralReverse Transcriptase InhibitorsHIVAIDS-Related Opportunistic InfectionsAntibodies, ViralSouth AfricaZidovudineCohort StudiesPrevalenceInfectious Disease Transmission, VerticalHIV SeronegativityAntibodies, BacterialNevirapineRNA, ViralMedication AdherenceChlamydophila pneumoniaeImmunoglobulin GChlamydophila InfectionsBenzoxazinesUgandaStavudineSerologic TestsEnzyme-Linked Immunosorbent AssayPregnancy Complications, InfectiousCross-Sectional StudiesRitonavirOrganophosphonatesDrug Therapy, CombinationPatient ComplianceHIV-Associated Lipodystrophy SyndromeHIV Reverse TranscriptaseProspective StudiesLamivudineLopinavirCoinfectionTreatment OutcomeDrug Resistance, Multiple, ViralHelicobacter pyloriHelicobacter InfectionsHepatitis CCD4-Positive T-LymphocytesZimbabweAdenineAIDS Dementia ComplexViremiaMalawiCytomegalovirus InfectionsIndinavirTreatment FailureRural PopulationToxocariasisBrazilAIDS SerodiagnosisHIV ProteaseCase-Control StudiesImmune Reconstitution Inflammatory SyndromeAntibodies, ProtozoanPregnancyHerpesvirus 2, HumanNelfinavirTime FactorsPyrimidinonesRetrospective StudiesLost to Follow-UpToxoplasmosisDidanosineHomosexuality, MaleIncidenceAfrica South of the SaharaBotswanaToxocaraIndiaAge FactorsBlood DonorsPapillomavirus InfectionsZambiaLogistic ModelsRisk-TakingSexual PartnersCytomegalovirusDideoxynucleosidesMultivariate AnalysisFollow-Up StudiesCarbon DioxideOdds Ratio