Estimated Number of New HIV Infections, by Transmission Method

"Although estimates of the number of new HIV infections are uncertain, the number of new infections in 2011 was estimated at 3,175 (range between 2,250 and 4,100) which was about the same as or slightly fewer than the estimate in 2008 (3,335; range of 2,370 to 4,300) (Table 2, Figure 2). In terms of exposure category, MSM continued to comprise the greatest proportion (46.6%) of new infections in 2011, which was slightly higher than the proportion they comprised in 2008 (44.1%). In 2011, the proportion of new infections among IDU was lower than in 2008 (13.7% compared to 16.9%). The proportion of new infections attributed to the heterosexual/non-endemic and heterosexual/endemic exposure categories were about the same in 2011 compared to 2008 (20.3% vs 20.1% and 16.9% vs 16.2%, respectively) (Figure 3)."