[Transient appearance of anti-erythrocyte autoantibodies during Rh alloimmunization].

Transient appearance of anti-erythrocyte autoantibodies was demonstrated in two women in the first stages of Rh alloimmunization. Any mimicking antibodies, or concurrent autoimmune haemolytic anaemia could be reasonably discarded in both patients. These facts are discussed on the basis of polyclonal activation followed by clonal selection driven by the antigen, as a mechanism of the humoral immune response. Investigation of such cases seems of great interest in subjects with recent alloimmunization in order to assess the incidence of this phenomenon and the antigen systems involved.