Abstract:
BACKGROUND:Trypanosoma cruzi, the protozoan cause of Chagas disease, causes life-long infection and is easily transmitted by blood transfusion. Our goals were to determine the prevalence of Chagas disease among donors in five Mexican blood banks, to look for evidence of transmission of T. cruzi by transfusion, and to evaluate two serologic assays for Chagas disease. STUDY DESIGN AND METHODS:Blood samples from donors were tested initially with the Abbott Chagas EIA or the Meridian Chagas' IgG ELISA. Samples giving readings that were at least 50% of the cutoffs were run in a confirmatory radioimmune precipitation assay (RIPA), as were samples from recipients of blood products from RIPA-positive donors. RESULTS:The overall prevalence of Chagas disease was 1/133 (55/7,296; 0.75%). In addition, 4 of 9 surviving recipients of blood products from T. cruzi-infected donors were in turn infected. Using the manufacturers' recommended cutoffs, the sensitivity and specificity of the Abbott test were 92.0% (23/25) and 99.8% (2,865/2,872) respectively, and the corresponding values for the Meridian assay were 70.0% (21/30) and 100.0% (4,369/4,369). CONCLUSIONS:These findings indicate clearly that transfusion-associated transmission of T. cruzi is occurring in the study areas. Serologic testing of blood donors for Chagas disease should be performed there and in the rest of Mexico. The two screening assays evaluated may lack the accuracy necessary for blood donor testing when used as suggested by the manufacturers.
journal_name
Transfusionjournal_title
Transfusionauthors
Kirchhoff LV,Paredes P,Lomelí-Guerrero A,Paredes-Espinoza M,Ron-Guerrero CS,Delgado-Mejía M,Peña-Muñoz JGdoi
10.1111/j.1537-2995.2006.00715.xsubject
Has Abstractpub_date
2006-02-01 00:00:00pages
298-304issue
2eissn
0041-1132issn
1537-2995pii
TRF00715journal_volume
46pub_type
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