In 1998, approximately 30 million people worldwide were living with HIV/AIDS, about 5 million of whom became infected that year. The epidemic continues to expand, with an estimated doubling time of 10 years, making AIDS the leading infectious cause of death ahead of tuberculosis and malaria. Even in the U.S.A. where the death rate from AIDS is declining as a result of effective drug therapies, HIV infection rates continue to climb in several population...