Figure 2. Shifts in HIV transmission patterns in the US based on estimates from the Centers for Disease Control and Prevention.

Figure 2. Shifts in HIV transmission patterns in the US based on estimates from the Centers for Disease Control and Prevention. Although men who have sex with men remains the major transmission category, high-risk heterosexual transmission now accounts for one-third of new HIV/AIDS cases. The use of syringe-exchange programs has been a key factor in recent declines in HIV infections attributable to injection-drug use. Data for 2006 reflect the most recent statistics available.