Rare Diego blood group phenotype Di(a+b-), I. Anti-Dib causing hemolytic disease of the newborn.

Hemolytic disease of the newborn was observed in the third child of a mother whose blood had rare Diego blood group phenotype Di(a+b-). The baby's blood was Di(a+b+) and gave positive direct anti-globulin test. The mother's serum contained anti-Dib antibody active in the anti-globulin method, which was judged to have caused the hemolytic disease of the newborn.