[Analysis of a national serological survey for diseases transmitted by blood transfusion].

In August 1992 information was requested from 49 Blood Banks in national hospitals and private institutions in order to carry out a serological screening of blood donors for diseases transmitted by transfusion. Data was requested from 1987 to the first semester of 1992 and included the total annual number of blood donors and the incidence of seropositivity for Chagas disease, brucellosis, syphilis, hepatitis B and C, and HIV. Out of a total of 1,075,051 blood donors registered (Table 1), there was 4.36% incidence of seropositivity for Chagas disease measured by indirect hemagglutination (Table 6): depending on the Province evaluated, the values fluctuated from 2.23 to 11.64% (Table 7). Seropositivity incidence for brucellosis, using Huddleson test, was 0.94% (Table 2 & 3), for syphilis, 0.93% (Table 4 & 5), for hepatitis B, 0.92% (Table 8 & 9), for hepatitis C, 0.56% (Table 10 & 11) and for HIV, 0.21% (Table 12 & 13). This first national screening has yielded important data which represent 60% of the total blood donations pertaining to the period evaluated.