Part 1 of Essay
? Today more Americans are infected with STD's than at any other time in history. The most serious of these diseases is AIDS. Since the first cases were identified in the United States in 1981, AIDS has touched the lives of millions of American families. This deadly disease is unlike any other in modern history. Changes in ....

Part 2 of Essay
.... American research, scientist Robert Gallo at the National Cancer Institute, one of the National Institutes of Health in Bethesda, Maryland, and a group headed by American virologist Jay Levy at the University of California at San Francisco isolated a retrovirus from people with AIDS and from individuals having contact with people with AIDS. All three groups of scientists had isolated what is now known as HIV, the virus that causes AIDS. In 1995 HIV was estimated to infect almost 20 million people worldwide, and ....