Serological examination for HIV-I antibodies in Nicaragua, Columbia and El Salvador.

22 of 182 sera samples from Nicaragua, 6 of 111 samples from Columbia, and 25 of 388 samples from El Salvador were positive in the ELISA test. 37 of the 53 positive sera samples were positive again in a further ELISA test, and 1 of them was positive in the IFT and Western Blot test.