HIV InfectionsViral LoadCD4 Lymphocyte CountPlasmaRNA, ViralAnti-HIV AgentsHIV-1HIV SeropositivityAntiretroviral Therapy, Highly ActiveHIVPeripartum PeriodHIV Protease InhibitorsViremiaAnti-Retroviral AgentsZidovudineAcquired Immunodeficiency SyndromeAIDS Dementia ComplexDidanosineBenzoxazinesRitonavirStavudineIndinavirLamivudineReverse Transcriptase InhibitorsDrug Therapy, CombinationNevirapinePlasma CellsDrug Resistance, ViralCD4-Positive T-LymphocytesHIV SeroprevalenceHIV SeronegativityProspective StudiesCohort StudiesVirus ReplicationTime FactorsTreatment FailureTreatment OutcomePatient ComplianceCell MembraneDNA, ViralDisease ProgressionInfectious Disease Transmission, VerticalPlasma GasesCD8-Positive T-LymphocytesAIDS SerodiagnosisDrug Administration ScheduleMultivariate AnalysisHIV AntigensPlasma VolumeSexual BehaviorPlasma ExchangeHomosexuality, MaleRisk-TakingHIV Core Protein p24HIV Reverse TranscriptaseSouth AfricaBiological MarkersHIV Envelope Protein gp120CholesterolPregnancyRisk FactorsChromatography, High Pressure LiquidLiverHIV ProteaseReceptors, HIVSexual PartnersSubstance Abuse, IntravenousPrevalenceTriglyceridesBlood GlucosePlatelet-Rich PlasmaMolecular Sequence DataCross-Sectional StudiesLipidsLipoproteinsInsulinHIV Long-Term SurvivorsRadioimmunoassayAIDS-Related Opportunistic InfectionsCondomsSemenUgandaZimbabweUnsafe SexReference ValuesDose-Response Relationship, DrugCell LineCoinfectionCells, CulturedAmino Acid SequenceArea Under CurveHealth Knowledge, Attitudes, PracticeCounselingLeukemia, Plasma CellBiological TransportEnzyme-Linked Immunosorbent AssayMembrane ProteinsCase-Control StudiesHomocysteineKidney