| human immunodeficiency v. |
a virus of the genus Lentivirus, separable into two serotypes (HIV-1 and HIV-2), that is the etiologic agent of the acquired immunodeficiency syndrome (AIDS). HIV-1, which comprises at least three subgroups (M, N, and O), is of worldwide distribution, while HIV-2 is largely confined to West Africa; transmission and manifestations are similar. HIV-1 was formerly called human T-cell lymphotropic v. type III and lymphadenopathy-associated v. See Plate 55.
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