HIV SeropositivityHIV InfectionsHIV SeroprevalenceAnti-HIV AgentsAntiretroviral Therapy, Highly ActiveAnti-Retroviral AgentsSubstance Abuse, IntravenousHIV-1Sexual BehaviorRisk FactorsDrug Resistance, ViralAntibodiesCD4 Lymphocyte CountSeroepidemiologic StudiesViral LoadReverse Transcriptase InhibitorsAntibodies, ViralHIV Protease InhibitorsAntibodies, BacterialAntibody SpecificityBenzoxazinesAcquired Immunodeficiency SyndromeZidovudineDrug Resistance, Multiple, ViralNevirapineHIVInfectious Disease Transmission, VerticalAntibodies, MonoclonalHIV Reverse TranscriptaseIndinavirRitonavirPregnancy Complications, InfectiousLopinavirStavudineOrganophosphonatesRNA, ViralHIV Fusion InhibitorsHIV ProteaseLamivudineNelfinavirAntibodies, NeutralizingDrug Therapy, CombinationPyrimidinonesAntibody FormationSouth AfricaAIDS-Related Opportunistic InfectionsAdenineUgandaCohort StudiesImmunoglobulin GHIV AntibodiesMedication AdherenceAntibodies, ProtozoanIntegrase InhibitorsPrevalenceHIV SeronegativityDidanosineHIV-Associated Lipodystrophy SyndromeTreatment FailureSaquinavirViremiaEnzyme-Linked Immunosorbent AssayFluorescent Antibody TechniquePregnancyAntibody AffinityZimbabweVirus ReplicationCross-Sectional StudiesHIV Integrase InhibitorsCD4-Positive T-LymphocytesGenotypeSerologic TestsAfrica South of the SaharaPatient ComplianceTreatment OutcomeTime FactorsChlamydophila pneumoniaeMutationDideoxynucleosidesMolecular Sequence Datapol Gene Products, Human Immunodeficiency VirusProspective StudiesImmunoglobulin MHIV Wasting SyndromeAntibodies, Anti-IdiotypicBinding Sites, AntibodyChlamydophila InfectionsDrug MonitoringMalawiBrazilOxazinesDrug InteractionsRetrospective StudiesCyclohexanesEpitopesDeveloping CountriesInfant, NewbornCross ReactionsImmunoglobulin AAntibodies, Neoplasm