Antiretroviral Therapy, Highly ActivePregnancyAnti-HIV AgentsHIV InfectionsAnti-Retroviral AgentsPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalCD4 Lymphocyte CountViral LoadHIV-1Pregnancy, EctopicPregnancy Complications, InfectiousPregnancy Trimester, FirstPregnancy Trimester, ThirdPregnancy RateDrug Resistance, ViralReverse Transcriptase InhibitorsPregnancy Complications, CardiovascularPregnancy TrimestersPregnancy TestsHIVHIV Protease InhibitorsPregnancy, MultipleAcquired Immunodeficiency SyndromeInfectious Disease Transmission, VerticalPregnancy in DiabeticsPregnancy, TubalPregnancy Trimester, SecondZidovudineNevirapineSouth AfricaPregnancy Complications, NeoplasticMedication AdherenceCohort StudiesPregnancy in AdolescenceBenzoxazinesAIDS-Related Opportunistic InfectionsStavudineRNA, ViralInfant, NewbornDrug Therapy, CombinationAbortion, SpontaneousRitonavirOrganophosphonatesPregnancy ProteinsPregnancy, UnplannedPregnancy, High-RiskPatient CompliancePregnancy, UnwantedGestational AgeLopinavirHIV-Associated Lipodystrophy SyndromeHIV SeropositivityLamivudineTreatment OutcomeProspective StudiesUgandaPregnancy Complications, HematologicDrug Resistance, Multiple, ViralTreatment FailureRisk FactorsAdeninePlacentaRetrospective StudiesPregnancy, ProlongedPre-EclampsiaViremiaPregnancy, TwinIndinavirTime FactorsImmune Reconstitution Inflammatory SyndromeBotswanaCD4-Positive T-LymphocytesLost to Follow-UpMalawiFetal DeathNelfinavirPyrimidinonesPrenatal CareDidanosineAIDS Dementia ComplexHIV Reverse TranscriptaseAbortion, InducedPregnancy, AbdominalUterusPregnancy Complications, ParasiticPregnancy MaintenanceMaternal-Fetal ExchangeUltrasonography, PrenatalEmbryo ImplantationDideoxynucleosidesDrug MonitoringEmbryo TransferCross-Sectional StudiesDrug Administration SchedulePrenatal Exposure Delayed EffectsAfrica South of the SaharaFertilization in VitroCoinfection