A delayed hemolytic reaction following transfusion occurred in a 23‐year‐old Chinese mother of six. Her blood was Jk(a—b—), and her serum contained a cross‐reacting anti‐JkaJkb as well as a separable anti‐Jka. Her husband and children were all Jk(a—b+). Although genetic transmission of Jk(a—b—) blood has not been proven as yet, it appears most probably to be the homozygous expression of a third allele or of gene deletion. To date, all instances of this type of blood have been found in populations of Asian origin.

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