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Israel Davidsohn, M.D.
JAMA. 1946;130(7):445. doi:10.1001/jama.1946.02870070065021.
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To the Editor:—  I wish to endorse Dr. Edgar's suggestion (The Journal, January 12, p. 107) that Dr. Harville (ibid., Nov. 17, 1945, p. 801) check the blood grouping tests in the family where he found a mother of group AB and a child of group O, and that the result be published in The Journal, This may forestall a great deal of trouble for those who are called on to testify in courts in cases of disputed paternity. It is possible that two factors may have contributed to the erroneous result in Dr. Harville's case (and erroneous it will no doubt turn out to be): The mother may be AB, subgroup A2B, and the child will then be A2, a subgroup in which the red cells are agglutinated less readily than in subgroup A1, especially in the newborn. That is the reason why it is recommended not to do


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