The present update to the data base incorporates all available epidemiological information for developing countries presented at the Third International Conference on AIDS in Asia and the Pacific, Chiang Mai, Thailand, September 1995, and the IX International Conference on AIDS and STDs in Africa, Kampala, Uganda, December 1995.  We also are regularly reviewing the scientific literature for relevant information. Currently, the HIV/AIDS Surveillance Data Base contains over about 27,000 individual data records drawn from 3,422 publications and presentations. It is our goal to incorporate all available data from seroprevalence studies conducted in developing countries.