HIV SeropositivityHIV InfectionsAntiretroviral Therapy, Highly ActiveHIV SeroprevalenceAnti-HIV AgentsAnti-Retroviral AgentsSubstance Abuse, IntravenousCD4 Lymphocyte CountViral LoadHIV-1Risk FactorsSexual BehaviorDisease ProgressionSeroepidemiologic StudiesAcquired Immunodeficiency SyndromeHIVHIV Protease InhibitorsAIDS-Related Opportunistic InfectionsDrug Resistance, ViralReverse Transcriptase InhibitorsSouth AfricaRNA, ViralCohort StudiesMedication AdherenceZidovudineStavudineNevirapineInfectious Disease Transmission, VerticalBenzoxazinesDrug Therapy, CombinationUgandaHIV-Associated Lipodystrophy SyndromeTreatment OutcomeRitonavirPatient ComplianceCD4-Positive T-LymphocytesViremiaImmune Reconstitution Inflammatory SyndromeOrganophosphonatesPregnancy Complications, InfectiousLamivudineLopinavirPrevalenceTreatment FailureProspective StudiesAIDS Dementia ComplexIndinavirCoinfectionHIV SeronegativityLost to Follow-UpCross-Sectional StudiesDrug Resistance, Multiple, ViralTime FactorsMalawiAdenineHIV Reverse TranscriptaseRetrospective StudiesBotswanaPyrimidinonesAntibodies, ViralDidanosineFollow-Up StudiesDrug Administration ScheduleLymphoma, AIDS-RelatedNelfinavirDrug MonitoringAfrica South of the SaharaZimbabweDirectly Observed TherapyZambiaHepatitis CIncidenceImmunoglobulin GHIV ProteaseEnzyme-Linked Immunosorbent AssayCote d'IvoireDideoxynucleosidesAntibodies, BacterialCytomegalovirus RetinitisChlamydophila pneumoniaePregnancyLongitudinal StudiesHIV Wasting SyndromeSerologic TestsTuberculosisAfrica, SouthernMultivariate AnalysisBrazilChlamydophila InfectionsVirus ReplicationCase-Control StudiesHIV Long-Term SurvivorsLipodystrophyDeveloping CountriesAntitubercular AgentsOxazinesRural PopulationKenyaSarcoma, KaposiLogistic Models