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In honor of World AIDS Day, the CDC has released a new set of statistics describing some aspects of the HIV epidemic among men who have sex with men (MSM) in the U.S.
In 2011, MSM accounted for at least half of all new HIV infections reported in every state except Pennsylvania and South Dakota. On behavioral surveillance questionnaires, the proportion of all MSM reporting unprotected anal sex during the preceding 12 months increased from 48% in 2005 to 54% in 2008 and 57% in 2011. This trend was observed among MSM who were uninfected (or unaware of their infection) and also among those who knew they were infected, but was statistically significant only in the former group.
In 2011, 33% of HIV-infected MSM who were unaware of their infection r…