1 The epidemiology of AIDS -- 2 Transfusion-associated AIDS -- 3 The human retroviruses causing AIDS -- 4 Effects of HIV infection on the immune system -- 5 T cell phenotyping in the diagnosis and management of AIDS and AIDS related disease -- 6 The immunosuppressive effects of blood -- 7 Serological tests -- 8 Donor screening for HIV in the United States -- 9 Blood donor screening for HIV infection: introduction in the United Kingdom and Europe and its impact on transfusion medicine -- 10 Asymptomatic infection with human immunodeficiency virus -- 11 Psychological and ethical implications of HIV screening -- 12 The future