[An epidemiological and immunological study of human immunodeficiency virus infection in the southern area of Madrid].

The clinical characteristics and immunological parameters are characterized in different groups of infection by human immunodeficiency virus (HIV) in patients infected by HIV, and the prognostic markers of survival in patients diagnosed of acquired immunodeficiency syndrome (AIDS). This study was carried out in 312 patients from June 1984 to March 1989. The most common risk group was intravenous drug addicts (IVDA) 80.9%. We observed that during the last years there was an increase in the number of cases of heterosexual transmission. Through follow up, 17.6% of patients developed acquired immunodeficiency (AIDS). The incidence rate for AIDS was higher amongst homosexuals than IVDA (35.4/14.6). Esophageal candidiasis and extrapulmonary tuberculosis were the AIDS indicators most frequently encountered. Once the study period was over, with a follow up of 19.3 +/- 3.4 months, the probability of survival after 12 months was 70 +/- 0.07% and after 24 months was 42% +/- 0.09%. The risk group (homosexuals), the appearance of a neoplasia as the first diagnosis of AIDS, and the immunological parameters (CD3 less than 500, CD4 less than 400, CD4/CD8 ratio less than 0.5 and total lymphocyte count of less than 1700 were the markers with worst prognosis which correlated with survival rates (p less than 0.01). We confirmed that when comparing immunologic parameters amongst HIV infection groups, IgA levels were higher (p less than 0.05); the total number of lymphocytes, the number of helper lymphocytes and the CD4/CD8 ratio were lower (p less than 0.01) in IV and AIDS group with respect to group II and III, in patients with AIDS with respect to group IV-non-AIDS and in those who died with relation to AIDS.