The authors present the trendy of some characteristics recorded in a group of subjects examined for HIV antibodies in the AIDS Centre of the District Hygiene Station in Karviná in 1993 to 2000. These characteristics reflect the development of activities of the Centre. During the period a total of 3733 HIV tests were made, incl, three positive ones. In two instances men with homosexual relations in the tase-history were involved, in one tase a male heterosexual. The declining trend of the ratio of anonymous examinations is apparent from 58.8 % in 1993 to 7.7 % in 2000. Parenteral drng users, prostitutes (in particular women) and homosexuáls account on a long-term basis for ca 30% of all examinations. Recently this ratio is even higher. Repeated examinations (check-ups) of the same client account for 16.1 % of all implemented HIV tests. At least once 384 parenteral drng users were examined, in prostitutes similarly as in men with homosexual relationships the number of subjects examined at least once is ca 200. Repeated tests were made in ca one quarter of all parenteral drng users, ca one third of the prostitutes and ca one fifth of homosexuáls. In none of the Repeated tests seroconversion to HIV pozitivity was recorded. To achieve Glose contact and monitoring of the HIV statute of groups with a risk behaviour despite their existence at the brink of law and despite their natural tendency to hide is real. Without collaborating organizations, without gaining their confidence and in particular without the confidence of the Clients this would not be possible.

        Key words: HIV/AIDS - HIV tests - parenteral drng users - „prostitution" - homosexuality.