| [prevalence of human infections by trypanosoma cruzi in blood banks in venezuela]. | primary investigations carried out in blood banks in venezuela during the 1950s, indicated that overall seroprevalence for trypanosoma cruzi infection was 12% amongst blood donors. in venezuela, blood donation is free. all public and private blood banks are controlled by the ministry of health. as from 1988 the elisa technique was uniformly used in blood banks for the detection of t. cruzi infections. annual median seroprevalence, between 1988 to 1992, was 1.20% (1.09-1.94%), with geographical v ... | 1993 | 8115813 |