![]() The FDA has approved a T. cruzi reentry algorithm requiring a follow-up sample testing nonreactive by the two FDA licensed screening tests and the ESA. An FDA licensed enzyme strip immunoassay (ESA) is used for confirmatory testing. The Red Cross blood donations are screened using the Ortho T. cruzi Enzyme-Linked Immunosorbent Assay (ELISA) for the qualitative detection of antibodies to T. The agent is endemic in Latin America, but approximately 20 reports of transmission by blood transfusion have been published worldwide. ![]() Chagas is a serious disease caused by the parasite Trypanosoma cruzi.
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