A ‘New’ Human Blood Group Antigen of Frequent Occurrence

Abstract

THE sera of two women, whose babies were suspected of suffering from hæmolytic disease of the new-born, were recently found to contain identical agglutinins of a variety not previously described. The serological examination of the two families is at present incomplete, but there is so far no definite evidence in either case that the agglutinin concerned is the result of immunization of the mother by the fœtus. Indeed, the red cells of one of the jaundiced babies were not agglutinated by its mother's serum: this points towards the agglutinin being spontaneous rather than immune.