Direct Measurement of Human Immunodeficiency Virus Seroconversions in a Serially Tested Population of Young Adults in the United States Army, October 1985 to October 1987

Abstract
Direct measurement of the incidence of infection with the human immunodeficiency virus (HIV)—the rate of new HIV infection — is vital if we are to understand better the dynamics of the current epidemic of HIV infection. Because soldiers are periodically and routinely screened for antibody to HIV, it is possible to measure the incidence of HIV infection directly in this large, demographically well-characterized population of young adults. To determine the incidence of HIV infection in this population, we examined test results reported by the U.S. Army's routine antibody-screening programs.