ZidovudineAnti-HIV AgentsDidanosineLamivudineStavudineReverse Transcriptase InhibitorsHIV InfectionsZalcitabineInfectious Disease Transmission, VerticalHIV-1NevirapineDideoxynucleotidesDideoxynucleosidesAIDS-Related ComplexAcquired Immunodeficiency SyndromeDrug Therapy, CombinationHIV Reverse TranscriptasePregnancy Complications, InfectiousIndinavirCD4 Lymphocyte CountHIV Core Protein p24BenzoxazinesDrug Resistance, ViralThymine NucleotidesViral LoadDouble-Blind MethodDrug InteractionsRNA, ViralAntiviral AgentsOrganophosphonatesOxazinesHIV Protease InhibitorsAntiretroviral Therapy, Highly ActiveDrug Administration ScheduleActivities of Daily LivingDrug Resistance, Multiple, ViralPregnancyDrug Resistance, MicrobialBotswanaHIVNelfinavirAnti-Retroviral AgentsAdenineLopinavirHalf-LifeAppetite StimulantsAdministration, OralRNA-Directed DNA PolymerasePyrimidinonesSaquinavirInfant, NewbornHIV SeropositivityRitonavirTreatment OutcomeLeukocyte CountThymidine MonophosphateNucleosidesDrug CombinationsTime FactorsTreatment FailureAIDS Dementia ComplexArea Under CurveTabletsFoscarnetAcyclovir