Drug Resistance, ViralTreatment FailureAnti-HIV AgentsViral LoadHIV InfectionsDrug ResistanceHIV-1Drug Resistance, Multiple, ViralAntiretroviral Therapy, Highly ActiveReverse Transcriptase InhibitorsCD4 Lymphocyte CountBenzoxazinesDrug Resistance, NeoplasmRitonavirNevirapineHIV Protease InhibitorsAnti-Retroviral AgentsLopinavirDrug Resistance, MultipleDrug Resistance, MicrobialDrug Therapy, CombinationRNA, ViralDideoxynucleosidesDrug Resistance, BacterialHeart FailureTropismOrganophosphonatesLamivudineMutationPyrimidinonesGenotypeTreatment OutcomeAdenineHIV Reverse TranscriptaseSpiro CompoundsNelfinavirOxazinesHIVSouth AfricaDrug Resistance, Multiple, BacterialHIV ProteaseZidovudineMedication AdherencePatient ComplianceAntiviral AgentsStavudineRibavirinCohort StudiesDrug Resistance, FungalMicrobial Sensitivity TestsMutation, MissenseDrug MonitoringIndinavirDrug Administration SchedulePyrrolidinonesAnti-Bacterial AgentsTime FactorsPolyethylene GlycolsViremiaDisease ResistanceVascular ResistanceP-GlycoproteinRetrospective StudiesProspective StudiesAcquired Immunodeficiency SyndromeAntitubercular AgentsInterferon-alphaenv Gene Products, Human Immunodeficiency VirusHepatitis C, ChronicBenzoatesTuberculosis, Multidrug-ResistantPeruMolecular Sequence DataPiperazinesOligopeptidesAntineoplastic AgentsPyridinesAntimalarialsHepacivirusSequence Analysis, DNAMultidrug Resistance-Associated ProteinsMycobacterium tuberculosisFollow-Up StudiesAmino Acid SubstitutionRisk FactorsATP-Binding Cassette TransportersR FactorsPhenotypeCell Line, TumorGenes, MDRPolymerase Chain ReactionDrug InteractionsStreptomycinTetracycline ResistancePenicillin ResistanceDoxorubicinDrug Resistance, Multiple, FungalDouble-Blind MethodDeoxycytidinepol Gene Products, Human Immunodeficiency Virus