HIV SeropositivityHIV InfectionsAntiretroviral Therapy, Highly ActiveHIV SeroprevalenceAnti-HIV AgentsAnti-Retroviral AgentsSubstance Abuse, IntravenousCD4 Lymphocyte CountViral LoadHIV-1Sexual BehaviorRisk FactorsSeroepidemiologic StudiesAcquired Immunodeficiency SyndromeHIVHIV Protease InhibitorsAIDS-Related Opportunistic InfectionsDrug Resistance, ViralReverse Transcriptase InhibitorsSouth AfricaRNA, ViralMedication AdherenceCohort StudiesZidovudineStavudineNevirapineInfectious Disease Transmission, VerticalBenzoxazinesDrug Therapy, CombinationUgandaHIV-Associated Lipodystrophy SyndromeRitonavirPatient ComplianceImmune Reconstitution Inflammatory SyndromeViremiaCD4-Positive T-LymphocytesOrganophosphonatesPregnancy Complications, InfectiousTreatment OutcomeLamivudineLopinavirPrevalenceTreatment FailureAIDS Dementia ComplexIndinavirLost to Follow-UpHIV SeronegativityCoinfectionDrug Resistance, Multiple, ViralMalawiCross-Sectional StudiesProspective StudiesHIV Reverse TranscriptaseAdenineBotswanaPyrimidinonesAntibodies, ViralDidanosineLymphoma, AIDS-RelatedNelfinavirRetrospective StudiesDrug MonitoringDirectly Observed TherapyAfrica South of the SaharaZimbabweTime FactorsZambiaDrug Administration ScheduleHIV ProteaseHepatitis CCote d'IvoireDideoxynucleosidesAntibodies, BacterialImmunoglobulin GIncidenceCytomegalovirus RetinitisFollow-Up StudiesChlamydophila pneumoniaeEnzyme-Linked Immunosorbent AssayHIV Wasting SyndromeSerologic TestsPregnancyTuberculosisAfrica, SouthernDisease ProgressionBrazilChlamydophila InfectionsLipodystrophyVirus ReplicationHIV Long-Term SurvivorsDeveloping CountriesOxazinesRural PopulationAntitubercular AgentsLongitudinal StudiesMultivariate AnalysisKenyaSarcoma, KaposiCase-Control StudiesPlasma