The high male:female ratios of reported AIDS cases (11:1) and HIV infections (14:1) and the high proportion of AIDS cases (72%) transmitted by male-to-male sexual contact give grounds for considering Costa Rica to be a Pattern I country-one where the disease is transmitted, primarily among homosexual/bisexual males. Despite a continued small number of hemophilia and transfusion-associated AIDS cases, screening of blood and blood products has provided a high degree of safety for the blood supply. ![]() This placed Costa Rica third among the seven Central American countries-both in terms of cumulative AIDS incidence and the cumulative number of cases. A total of 283 AIDS cases were reported in the country between 1983, when the first cases were diagnosed, and the end of August 1991. ![]() ![]() This article describes and assesses the epidemiology of AIDS and HIV infection in Costa Rica.
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