Drug Resistance, ViralHIV InfectionsAnti-HIV AgentsAntiretroviral Therapy, Highly ActiveLesothoAnti-Retroviral AgentsHIV-1HIV ProteaseHIV Reverse TranscriptaseViral LoadDrug Resistance, Multiple, ViralReverse Transcriptase InhibitorsTreatment FailureRNA, ViralGenotypeMutationCD4 Lymphocyte CountDrug ResistanceHIV SeropositivityDrug Resistance, MicrobialDrug Resistance, BacterialHIV Protease InhibitorsAcquired Immunodeficiency SyndromeDrug Resistance, NeoplasmHIVSouth AfricaZidovudineDrug Resistance, MultipleNevirapineAIDS-Related Opportunistic InfectionsMedication AdherenceDisease ResistanceBenzoxazinesStavudineVascular ResistanceInfectious Disease Transmission, VerticalDrug Therapy, CombinationOrganophosphonatesDrug Resistance, Multiple, BacterialRitonavirCohort StudiesHIV SeronegativityUgandaPatient ComplianceMicrobial Sensitivity TestsAnti-Bacterial AgentsLamivudineHIV-Associated Lipodystrophy SyndromeTreatment OutcomeLopinavirAdenineCD4-Positive T-LymphocytesHIV SeroprevalencePregnancy Complications, InfectiousIndinavirViremiaMalawiAIDS Dementia ComplexTime FactorsPyrimidinonesNelfinavirCoinfectionMolecular Sequence DataPrevalenceImmune Reconstitution Inflammatory SyndromeRisk FactorsDidanosineLost to Follow-UpAfrica South of the SaharaBotswanaAntitubercular AgentsTetracycline ResistanceCross-Sectional StudiesProspective StudiesVirus ReplicationDideoxynucleosidesZambiaCote d'IvoireZimbabweDrug MonitoringPlant DiseasesDrug Administration SchedulePenicillin ResistanceAIDS SerodiagnosisAntiviral AgentsPregnancyRetrospective StudiesTuberculosisDrug Resistance, FungalDirectly Observed TherapySexual BehaviorAirway ResistanceHIV AntigensHomosexuality, MaleLipodystrophyHIV Integrase InhibitorsSubstance Abuse, IntravenousSequence Analysis, DNADeveloping CountriesHIV Long-Term Survivors