Updates: Routine screening for antibodies to HIV-1, civilian applicants for U.S. military service and U.S. Armed Forces, active and reserve components.

During routine testing of civilian applicants for U.S. military service, the overall seroprevalence of antibodies to HIV-1 was lower in 2010 than in any year since 1990. Among members of the active components of the U.S. Army and Air Force, HIV-1 seroprevalences were higher in 2008-2010 than in recent prior years. Among members of the active components of the U.S. Navy and Marine Corps, the Marine Corps Reserve, and the Army National Guard, HIV-1 seroprevalences have slightly declined or remained relatively stable for at least ten years. In the reserve components of most of the service branches, it is difficult to discern long-term trends because of instability of seroprevalences observed in the relatively small numbers of reserve component members tested each year.