[AIDS/HIV epidemiological surveillance in Navarra].
The incidence of AIDS in the European Union has been declining since 1996 as a result, at least in part, of the use of more efficient treatments for HIV infection. The same tendency can be observed in Navarra. In 1998 the incidence of AIDS in Navarra, 75 cases per million inhabitants, was situated at an intermediate level in the ranking of Spanish autonomous communities. In the same year, the highest rates of incidence in Europe were recorded in Spain (93.3 cases per million inhabitants) and Portugal (81.8), and the lowest in Ireland and Finland, with less than 5 cases per million inhabitants. With respect to the incidence of HIV infection, 2,240 cases were diagnosed in Navarra between 1985 and December 1998. The available data indicate that at least 1,864 of these cases were resident in Navarra. The annual number of new diagnoses of HIV infection show two high points in the years 1987 and 1991, with over 200 annual cases. From 1993 onwards, a progressive decline can be observed in the annual number, with 171, 145, 19, 86 and 63 cases in the final year, 1998. The figure of over 2,000 cases of HIV infection contrast with the 694 cases of AIDS registered in this autonomous community in the same period and help to resituate the epidemic in more accurate terms. The development of AIDS in 40% of the persons with HIV infection and the death of 26% have been confirmed, although lethality has been declining in recent years. The use of intravenous drugs in 73.2% of the AIDS cases is the most frequent category of transmission. 13.4% are due to transmission by heterosexual contact and 6.1% to homosexual practices between males. Although the cases of AIDS have been declining in Navarra since 1996, the data from the microbiology laboratories and from the hospital services that treat persons with HIV infection indicate that a considerable number of new infections will continue to occur, which justifies the need for maintaining the prevention programs in order to avoid new cases of a disease whose prognosis is of such seriousness