ZidovudineAnti-HIV AgentsDidanosineDrug Resistance, MicrobialDrug ResistanceLamivudineStavudineReverse Transcriptase InhibitorsDrug Resistance, BacterialHIV InfectionsDrug Resistance, ViralZalcitabineHIV-1Drug Resistance, NeoplasmNevirapineInfectious Disease Transmission, VerticalDrug Resistance, MultipleDideoxynucleotidesDideoxynucleosidesHIV Reverse TranscriptaseAcquired Immunodeficiency SyndromeDrug Therapy, CombinationAIDS-Related ComplexDisease ResistanceVascular ResistanceDrug Resistance, Multiple, BacterialPregnancy Complications, InfectiousIndinavirMicrobial Sensitivity TestsCD4 Lymphocyte CountAnti-Bacterial AgentsMutationDrug Resistance, Multiple, ViralHIV Core Protein p24BenzoxazinesAntiviral AgentsViral LoadThymine NucleotidesRNA, ViralTetracycline ResistanceHIV Protease InhibitorsOrganophosphonatesMolecular Sequence DataDrug InteractionsAntiretroviral Therapy, Highly ActivePlant DiseasesPenicillin ResistanceOxazinesHIVDrug Resistance, FungalAirway ResistancePregnancyBotswanaGenotypeAnti-Retroviral AgentsAdeninePhenotypeNelfinavirDouble-Blind Methodbeta-Lactam ResistanceBacterial ProteinsResistance TrainingTime FactorsLopinavirTreatment FailureRNA-Directed DNA PolymeraseBase SequencePolymerase Chain ReactionInfant, NewbornR FactorsTrimethoprimEscherichia coliPyrimidinonesDrug CombinationsDrug Administration ScheduleNucleosidesSaquinavirImmunity, InnateAppetite StimulantsHalf-LifeHIV SeropositivitySequence Analysis, DNADNA, BacterialP-GlycoproteinAmpicillin ResistanceRitonavirChloramphenicol ResistanceFoscarnetDose-Response Relationship, DrugAmino Acid SequenceTrimethoprim-Sulfamethoxazole CombinationVirus ReplicationLeukocyte CountThymidine MonophosphateTetracyclineGenes, polPlasmidsGenes, BacterialAnti-Infective AgentsMutation, Missense