Acquired Immunodeficiency SyndromeSyndromeMurine Acquired Immunodeficiency SyndromeHIV-1HIV InfectionsSimian immunodeficiency virusHIVAIDS-Related Opportunistic InfectionsSimian Acquired Immunodeficiency SyndromeAIDS-Related ComplexImmunologic Deficiency SyndromesFeline Acquired Immunodeficiency SyndromeImmunodeficiency Virus, FelineHomosexualitySevere Combined ImmunodeficiencyHIV SeropositivityAnti-HIV AgentsZidovudineCD4 Lymphocyte CountCommon Variable ImmunodeficiencyPneumonia, PneumocystisHIV AntibodiesVirus ReplicationLymphoma, AIDS-RelatedMolecular Sequence Datatat Gene Products, Human Immunodeficiency VirusAntiretroviral Therapy, Highly ActiveHIV AntigensHIV-2DeltaretrovirusHIV Envelope Protein gp120Sarcoma, KaposiMacaca mulattaRNA, ViralHIV Core Protein p24Viral LoadGene Products, gagOpportunistic InfectionsCytomegalovirus RetinitisDown SyndromeAntigens, CD4DNA, ViralMetabolic Syndrome XCD4-Positive T-LymphocytesReverse Transcriptase InhibitorsBase SequenceCell LineRetroviridae InfectionsT-LymphocytesToxoplasmosis, CerebralAmino Acid SequenceRisk FactorsHIV Reverse TranscriptaseMutationTime FactorsLymphatic DiseasesHIV SeronegativityGene Products, envnef Gene Products, Human Immunodeficiency VirusRetroviridae ProteinsAntiviral AgentsAIDS SerodiagnosisUnited StatesPolymerase Chain ReactionFatal OutcomeDidanosinegag Gene Products, Human Immunodeficiency VirusSubstance Abuse, IntravenousAIDS Dementia ComplexHIV SeroprevalenceAntibodies, ViralReceptors, CCR5HIV Protease InhibitorsPrevalenceRNA-Directed DNA PolymeraseAIDS VaccinesHIV Long Terminal RepeatPentamidinerev Gene Products, Human Immunodeficiency VirusGene Products, tatImmunocompromised HostProspective StudiesHemophilia ATreatment OutcomeProvirusesCohort StudiesNephrotic SyndromeZalcitabineDisease ProgressionMycobacterium avium-intracellulare InfectionSjogren's SyndromeLeukocyte CountRetrospective StudiesHIV Envelope Protein gp41Leukocytes, MononuclearContraceptive Devices, MaleCells, CulturedGenes, envHistoplasmosisNeutralization Tests