Viral TropismTropismAntiretroviral Therapy, Highly ActiveHIV InfectionsHIV-1Anti-HIV AgentsAnti-Retroviral AgentsReceptors, VirusCoxsackie and Adenovirus Receptor-Like Membrane ProteinViral LoadReceptors, CCR5Receptors, HIVCD4 Lymphocyte CountReceptors, CXCR4Virus ReplicationRNA, ViralHIV Envelope Protein gp120Genetic VectorsCell LineCapsid ProteinsTransduction, GeneticDrug Resistance, ViralMolecular Sequence DataHIVViral Envelope ProteinsReverse Transcriptase InhibitorsAdenoviridaeAcquired Immunodeficiency SyndromeHIV Protease InhibitorsZidovudineNevirapineInfectious Disease Transmission, VerticalMedication AdherenceSouth AfricaBenzoxazinesAIDS-Related Opportunistic InfectionsStavudineCyclohexanesRitonavirCD4-Positive T-LymphocytesDrug Therapy, CombinationOrganophosphonatesVirus AttachmentViremiaPatient ComplianceHIV SeropositivityPregnancy Complications, InfectiousLopinavirCohort StudiesHIV-Associated Lipodystrophy SyndromeLamivudineDrug Resistance, Multiple, ViralAIDS Dementia ComplexTreatment OutcomeUgandaAdenineVirus InternalizationTreatment FailureIndinavirHIV Fusion InhibitorsDNA, ViralImmune Reconstitution Inflammatory SyndromeBotswanaLost to Follow-UpPyrimidinonesNelfinavirDidanosineHIV Reverse TranscriptaseMalawiCarbon Dioxideenv Gene Products, Human Immunodeficiency VirusGenotypeTime FactorsDideoxynucleosidesAmino Acid SequenceDrug MonitoringPlasmaCoinfection