1. 
   ABO incompatibility
   <haematology> A type of blood incompatibility, found rarely. Transfusion reactions may occur as a result of such incompatibility. ... (27 Sep 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?ABO+incompatibility
   
   
2. 
   ABO Incompatibility
   The potential for isoimmunization occuring in approximately 5% of pregnancies when the mother's blood group is type O, with anti-A and anti-B, while the fetus's blood group is A, B or AB.
   Found op http://www.pregnology.com/AZ/A/1
   
   

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