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The presence of maternal cells was determined in a blood sample of 86 rhesus D-negative newborns with a rhesus D-positive mother using the ‘minor cell population technique’ of Jones and Silver. Maternal cells were found in 43% of the samples, irrespective of ABO incompatibility. Anti-D antibodies were detected in 22.2% of serum samples from 53 children taken at 6-10 months after birth. There was no correlation between the presence of anti-D and the results of the minor cell population technique at birth. The results are discussed.

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