A serologically typical group A2B mother with no unusual anti-A or anti-B agglutinins delivered a normal group O infant with no demonstrable A or B antigens. By the age of 1 year the child had developed anti-A and anti-B agglutinins. He had H antigen and secreted H substance in his saliva. A second group O child has since been born. Although family studies were inconclusive, the most likely explanation is that the mother is a cis-AB. If this is the case, she differs from other reported cis-ABs in her apparently normal B antigen and the lack of anti-B antibodies in her serum.
A serologically typical group A2B mother with no unusual anti-A or anti-B
agglutinins delivered a normal group O infant with no demonstrable A or B antigens. By the
age of 1 year the child had developed anti-A and anti-B agglutinins. He had H antigen and secreted
H substance in his saliva. A second group O child has since been born. Although family
studies were inconclusive, the most likely explanation is that the mother is a m-AB. If this is
the case, she differs from other reported m-ABs in her apparently normal B antigen and the
lack of anti-B antibodies in her serum.
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