A new government study released on Saturday found that over the past decade, the rate of HIV diagnoses in the United States declined by one-third. 16 out of every 100,000 people age 13 and older were newly diagnosed in 2011, a marked drop from the 24 out of every 100,000 who were diagnosed in 2002. The exact reason for the drop has yet to be determined—it could mean that either` there are actually fewer new infections, or that most of the infected have already been diagnosed. The drop was seen in a variety of demographics and age groups. The only group that saw an increase in diagnoses was young gay and bisexual men.