Stephen B. Thacker CDC Library collection

Gay and bisexual men — referred to in CDC surveillance systems as men who have sex with men (MSM)1 — of all races continue to be the risk group most severely affected by HIV. CDC’s most recent data show that between 2008 and 2010, the number of new infections among MSM increased 12 percent, with an even steeper increase among the youngest MSM. These data clearly show the urgent need to expand access to proven HIV prevention programs for gay and bisexual men, and to develop new approaches to fight HIV in this population.