HIV SeropositivityHIV InfectionsHIV SeroprevalenceAnti-HIV AgentsAntiretroviral Therapy, Highly ActiveAnti-Retroviral AgentsSubstance Abuse, IntravenousHIV-1Risk FactorsSexual BehaviorDrug Resistance, ViralCD4 Lymphocyte CountAntibiotic ProphylaxisViral LoadSeroepidemiologic StudiesReverse Transcriptase InhibitorsHIV Protease InhibitorsZidovudineBenzoxazinesAcquired Immunodeficiency SyndromeNevirapineDrug Resistance, Multiple, ViralInfectious Disease Transmission, VerticalHIVPregnancy Complications, InfectiousOrganophosphonatesHIV Reverse TranscriptaseIndinavirLopinavirRitonavirStavudineLamivudineDrug Therapy, CombinationHIV ProteaseHIV Fusion InhibitorsRNA, ViralAIDS-Related Opportunistic InfectionsNelfinavirAdenineSouth AfricaPyrimidinonesPost-Exposure ProphylaxisUgandaCohort StudiesMedication AdherenceIntegrase InhibitorsPrevalenceHIV SeronegativityTreatment FailureDidanosineHIV-Associated Lipodystrophy SyndromeTreatment OutcomeSaquinavirAntibodies, ViralZimbabwePregnancyViremiaProspective StudiesPatient ComplianceAfrica South of the SaharaCross-Sectional StudiesHIV Integrase InhibitorsVirus ReplicationGenotypeRetrospective StudiesAntiviral AgentsCD4-Positive T-LymphocytesAntibodies, BacterialHIV Wasting SyndromeDideoxynucleosidespol Gene Products, Human Immunodeficiency VirusMalawiTime FactorsDrug MonitoringImmunoglobulin GChlamydophila pneumoniaeDental ProphylaxisDrug Administration ScheduleInfant, NewbornMutationChemopreventionIncidenceDrug InteractionsSerologic TestsChlamydophila InfectionsBrazilDeveloping CountriesOxazinesCyclohexanesCytomegalovirus InfectionsEnzyme-Linked Immunosorbent AssayCommission on Professional and Hospital ActivitiesFollow-Up StudiesTrimethoprim-Sulfamethoxazole CombinationGenes, polPlasmaDrugs, GenericPyrrolidinonesLipodystrophyCoinfection