Abstract
Investigation of mild bilirubinaemia and a positive direct antiglobulin test in a 2 day old baby revealed that the mother’s serum contained an antibody against the low frequency antigen ELO, which was present on the father’s red cells. Family studies showed that the ELO antigen segregates from Rh, Gc, ADA and PGM(1). The ELO antigen is enzyme resistant and therefore not likely to be part of the MNS or Duffy systems. No abnormalities were detected in immu- noblotting studies. Although insufficient samples were available to attempt elution of the antibody from the cord cells, it is probable that this case represents the first reported haemolytic disease of the newborn due to anti-ELO.
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