IgG antibodies to lymphadenopathy-associated virus ( LAV ) were found by a specific enzyme-linked immunosorbent assay in 18/48 (37.5%), patients with acquired immunodeficiency syndrome, 38/51 (74.5%) patients with lymphadenopathy syndrome, 8/44 (18%) homosexual men without lymphadenopathy, and 1/100 unselected blood donors.
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