Acquired Immunodeficiency SyndromeImmunodeficiency Virus, FelineSyndromeMurine Acquired Immunodeficiency SyndromeFeline Acquired Immunodeficiency SyndromeHIV-1Leukemia Virus, FelineHIV InfectionsCatsSimian immunodeficiency virusHIVAIDS-Related Opportunistic InfectionsCat DiseasesSimian Acquired Immunodeficiency SyndromeAIDS-Related ComplexImmunologic Deficiency SyndromesCalicivirus, FelineCoronavirus, FelineHomosexualitySevere Combined ImmunodeficiencyHIV SeropositivityMolecular Sequence DataZidovudineAnti-HIV AgentsFeline PanleukopeniaVirus ReplicationCD4 Lymphocyte CountSarcoma Viruses, FelineCommon Variable ImmunodeficiencyPneumonia, PneumocystisHIV AntibodiesFeline Infectious PeritonitisLymphoma, AIDS-Relatedtat Gene Products, Human Immunodeficiency VirusFeline panleukopenia virusAntiretroviral Therapy, Highly ActiveHIV AntigensHIV-2RNA, ViralGene Products, gagDeltaretrovirusDNA, ViralLentivirus InfectionsHIV Envelope Protein gp120Retroviridae InfectionsCell LineBase SequenceSarcoma, KaposiViral LoadMacaca mulattaLeukemia, FelineHIV Core Protein p24Opportunistic InfectionsCytomegalovirus RetinitisAmino Acid SequenceAntigens, CD4CD4-Positive T-LymphocytesDown SyndromeMetabolic Syndrome XReverse Transcriptase InhibitorsT-LymphocytesAntibodies, ViralRetroviridae ProteinsGene Products, envPolymerase Chain ReactionToxoplasmosis, CerebralMutationTime FactorsRisk FactorsHIV Reverse TranscriptaseAntiviral AgentsProvirusesRNA-Directed DNA PolymeraseFatal OutcomeLymphatic DiseasesHIV Seronegativitynef Gene Products, Human Immunodeficiency VirusUnited StatesAIDS SerodiagnosisDidanosineGenes, envgag Gene Products, Human Immunodeficiency VirusSubstance Abuse, IntravenousAIDS Dementia ComplexPrevalenceReceptors, CCR5HIV SeroprevalenceAIDS VaccinesHIV Protease InhibitorsNeutralization TestsHIV Long Terminal RepeatPentamidinerev Gene Products, Human Immunodeficiency VirusCells, CulturedLeukocytes, MononuclearGene Products, tatZalcitabineImmunocompromised HostTreatment OutcomeProspective Studies