Data from 1996-1998: Leiby DA, Herron RM Jr, Read EJ, Lenes BA, Stumpf RJ. Trypanosoma cruzi in Los Angeles and Miami blood donors: impact of evolving donor demographics on seroprevalence and implications for transfusion transmission. Transfusion. 2002 May;42(5):549-55.

Data from 2006: Dr. Susan L. Stramer, Executive Scientific Officer, American Red Cross, presentation at 2006 annual meeting of the American Association of Blood Banks (AABB), "Ongoing Clinical Evaluations of a Chagas’ ELISA in US Blood Donors; Trypanosoma cruzi Antibody Prevalence in Three Regions of the American Red Cross” 23 October 2006.