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1.INTRODUCTION In June 1981, the centers for The Disease Control of the United States reported that five young homosexual men in the Los Angels area had contracted Pneumocystis Carinii pneumonia( a kind of pneumonia that is particularly found in AIDS patient). 2 o ....

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.... the U.S.A. have retentified five groups of adults at risk for developing AIDS. The case distribution in these groups are as follows: (1). Homosexuals or bisexual males constitute the largest group, about 60% of the reported cases. This includes 5% who were intravenuous drug as well. (2). Intravenous drug users with no previous history of homosexuality compose the next largest group, about 23% of all patients. (3). Hemophiliacs (the people who have inborn disease characterized by excesssive bleeding and occuring only in males) especially those who received factor VIII concentrate before 1985, about 1% of all patients. (4). Recipents of blood and blood ....