serologic and immunologic studies were performed in 38 african and 60 us patients with acquired immunodeficiency syndrome ( aids ) , 100 african and 100 us heterosexual men and women , and 100 us homosexual men to examine the potential role of infectious agents in human immunodeficiency virus ( hiv ) infection .
C0001175
acquired immunodeficiency syndrome
C0019693
human immunodeficiency virus