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Am J Vet Res. 1986 Dec;47(12):2566-71.

Clinical survey of antibodies against red blood cells in horses after homologous blood transfusion.


Serum samples of 20 horses were evaluated for antibodies against RBC after homologous blood transfusion. Transfusion-associated antibodies against RBC were detected in 10 horses. Antibodies recognizing horse blood group antigens Aa, Ae, Db, and Dc were identified. Antibodies against Aa were found in all samples from Aa-negative horses that were transfused with Aa-positive RBC. Antibodies against Aa persisted for at least 1 year after transfusion. Antibodies against Ae were detected in 7 of 8 horses transfused with Ae-positive RBC. Initial appearance and persistence of antibodies against Ae differed among the horses; antibodies were initially detected 1 week to 154 weeks after transfusion and disappeared as early as 4 weeks after transfusion. Antibodies against Db or Dc were detected in less than or equal to 33% of the horses that lacked Db or Dc antigens and were transfused with Db- or Dc-positive RBC. Antibodies against Db and Dc were initially detected in sera later than were the A-system antibodies. Three mares with transfusion-associated antibodies subsequently produced healthy offspring. Two foals had RBC antigens corresponding to their dam's alloantibodies; maternal colostrum with antibodies against Aa was withheld from the Aa-positive foal. The Db-positive foal remained healthy after nursing the mare with serum antibodies against Db.

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