Dr. David Hardy, director of infectious disease at Cedars-Sinai Medical Center in Los Angeles, emphasizes that we already have methods for prevention of the HIV epidemic, especially among gay men and African-Americans. He tells host Dr. Maurice Pickard that, if implemented, the Centers for Disease Control and Prevention's new recommendation for testing, that does away with exceptionism, would go a long way towards diagnosing the 25 percent of cases in the United States that are not identified.