umls-concept:C0019682 | skos:definition | MSH: Human immunodeficiency virus. A non-taxonomic and historical term referring to any of two species, specifically HIV-1 and/or HIV-2. Prior to 1986, this was called human T-lymphotropic virus type III/lymphadenopathy-associated virus (HTLV-III/LAV). From 1986-1990, it was an official species called HIV. Since 1991, HIV was no longer considered an official species name; the two species were designated HIV-1 and HIV-2.,CSP: species of Lentivirus, subgenus primate lentiviruses, formerly designated T cell lymphotropic virus type III/lymphadenopathy associated virus (HTLV-III/LAV); it is acknowledged to be the agent responsible for the acute infectious manifestations, neurologic disorders, and immunologic abnormalities linked to the Acquired Immunodeficiency Syndrome (AIDS).,NCI: The cause of acquired immunodeficiency syndrome (AIDS).,NCI: A cytopathic retrovirus. It is the etiological agent of AIDS.,NCI: The virus isolated and recognized as the etiologic agent of AIDS. HIV-1 is classified as a lentivirus, a su | lld:umls |