[Hemolytic disease of the newborn due to anti-S-antibodies].

In the serum of S-negative secundi para woman a specific anti-S agglutinin of the IgG type was identified. The same agglutinin was identified in the serum and on the eritrocytes of the newborn with sympthomes of a light Hemolytic disease. Exchange transfusion was not necessary. The anti-S described is an immune warm agglutinin showing the efect of dose and is discovered only by the Coombs technique.