Trends in HIV incidence among young adults in the United States.

Abstract
THE INCIDENCE of human immunodeficiency virus (HIV) in the United States during the 1990s has fallen to levels below the peak of the mid-1980s,1-3 but much of this decline reflects trends in white homosexual men older than 30 years.2 Because high-risk sexual behaviors and drug use are usually initiated in adolescence or young adulthood,4 the epidemic continues to be propagated in young people.