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human immunodeficiency virus
med. HI virus (Andrey Truhachev)
human immunodeficiency virus HIV
med. The virus that causes AIDS, which is the most advanced stage of HIV infection. HIV is a retrovirus that occurs as two types: HIV-1 and HIV-2. Both types are transmitted through direct contact with HIV-infected body fluids, such as blood, semen, and genital secretions, or from an HIV-infected mother to her child during pregnancy, birth, or breastfeeding through breast milk. see also acquired immunodeficiency syndrome, HIV-1, HIV-2, retrovirus