Part 1 of Essay
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 of the patients had died. This report signalled the begninni ....

Part 2 of Essay
.... MODE OF TRANSMISSION Studies in 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 ....