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MMWR. Morbidity and Mortality Weekly Report. 1986 Jan 24; 35(3):35-46.As of September 30, 1985, 1573 cases of acquired immunodeficiency syndrome (AIDS) had been reported by the 21 European countries that are participants in the World Health Organization (WHO) European Collaborating Center on AIDS. An average increase of 27 new cases/week has been noted. Of the total cases, there have been 792 deaths, for a case-fatality rate of 50%. The greatest increases in numbers of AIDS cases have occurred in the Federal Republic of Germany, France, the UK, and Italy. The highest rates exist in Switzerland (11.8), Denmark (11.2), and France (8.5). 65% of European AIDS patients have 1 or more opportunistic infection. 20% had Kaposi's sarcoma, alone, and 13% had opportunistic infections with Kaposi's sarcoma. 92% of cases have involved males, and 42% fall into the 30-39-year age group. Of the 1330 (85%) cases involving Europeans, 78% were homosexual or bisexual men, 70% were intravenous drug abusers, and 2% had both these risk factors. Africans have contributed 10% of European AIDS cases. A questionnaire on public health measures related to blood transfusion found that systematic screening of blood donors for lymphadenopathy-associated virus/human T-lymphotropic virus type III (LAV/HTLV-III) antibodies became effective in 16 of the 21 European countries between June-November 1985. Screening is compulsory in 13 countries. The test used is the enzyme-linked immunosorbent assay (ELISA). Portugal is the only country to have organized a national register of seropositive blood donors, although Norway is considering such a register. Methods to exclude donors at risk have been taken in all the countries except Czechoslovakia, Finland, and Portugal. Although male homosexuals account for 69% of reported AIDS cases in Europe, there has been an increase in cases among intavenous drug abusers from 2% of the total in July 1984 to 8% in September 1985. Over 40% of AIDS cases in Italy and Spain occurred in this group. Moreover, several studies carried out in 1985 showed a high frequency (20-50%) of serologic markers of LAV/HTLV-III infection in intravenous drug abusers.