Reverse Transcriptase InhibitorsNucleosidesHIV Reverse TranscriptaseAnti-HIV AgentsDrug Resistance, ViralZidovudineHIV-1BenzoxazinesPurine NucleosidesPyrimidine NucleosidesNevirapineDideoxynucleosidesHIV InfectionsOrganophosphonatesStavudineDelavirdineZalcitabineRNA-Directed DNA PolymeraseDideoxynucleotidesAdenineHIV Protease InhibitorsDidanosineLamivudineAntiviral AgentsDrug Resistance, Multiple, ViralNucleoside Transport ProteinsOxazinesAntiretroviral Therapy, Highly ActivePyrimidinonesArabinonucleosidesThymine NucleotidesRitonavirDioxolanesEquilibrative Nucleoside Transporter 1PyridazinesViral LoadPyranocoumarinsMutationLopinavirDeoxycytidine KinaseVirus ReplicationDrug Therapy, CombinationHIVRNA, ViralMolecular Sequence DataCD4 Lymphocyte CountCytidineGuanosineAcidosis, LacticAnti-Retroviral AgentsDeoxycytidineDeoxyribonucleosidesNelfinavirDeoxyadenosinesKineticsCladribineTreatment FailureRibonucleosidesUridineArabinofuranosyluracilMolecular StructureBase SequenceThioinosineStructure-Activity RelationshipAcyclovirTubercidinRibonuclease HNucleotidesDrug Resistance, MicrobialThymidine KinaseDrug InteractionsCell LineInosineIndinavirHIV ProteaseInhibitory Concentration 50Reverse Transcriptase Polymerase Chain ReactionSaquinavirHIV-Associated Lipodystrophy SyndromeHIV-2HIV Integrase InhibitorsPurine-Nucleoside PhosphorylaseDNA, ViralTelomeraseAdenosineGenotypeAmino Acid SubstitutionAcquired Immunodeficiency SyndromeThymidineDeoxyuridineModels, MolecularDNA, MitochondrialAmino Acid SequenceReverse TranscriptionGuanineFuransMutation, MissenseGanciclovirPurinespol Gene Products, Human Immunodeficiency Virus