Increasing incidence of HIV infections among young gay and biseuxal men inVancouver

Since the beginning of the HIV epidemic in north America, the majority of H IV infections have occurred among men who engage in sexual relations with o ther men. As the HIV epidemic enters its third decade, gay and bisexual men continue to have among the highest rates of HIV infection. Previous studie s [1,2] have highlighted the decline in the incidence of HIV and risk behav iour among gay and bisexual men. However, several studies [3,4] have sugges ted that young gay and bisexual men continue to engage in unprotected sexua l behaviours and are at continued risk of HIV infection. Recent reports in the media [5-9] and research literature [10,11] have indicated an increase in the incidence of HIV among gay and bisexual individuals in many of the w orld's major cities. The purpose of this study was to determine trends in H IV incidence using data from a prospective cohort of young gay and bisexual men.