New diagnoses of HIV infection acquired through sex between men and women in the United Kingdom (excludes individuals infected through sex between men and women in the United Kingdom by a “high risk” partner (partner infected through injecting drug use, sex between men, blood transfusion, or blood products)), by year of diagnosis and sexual partner's probable region of infection. Reports received by end of June 2004, diagnoses in adults (aged 15 or older) reported in England, Wales, and Northern Ireland. Scottish data are not included as the reporting system run by the Scottish Centre for Infections and Environmental Health (SCIEH) differs in respect to follow up of infections acquired through heterosexual intercourse. (United Kingdom is used throughout to refer to country of infection, as the surveillance system records the information at this level)