[Haemolytic disease of the new-born by blood-factor incompatibility other than Rh(d) and ABO (author's transl)].

Rare forms of incompatibility were observed over a period of 20 years in 41 (2%) of 2088 new-borns with haemolytic disease. Antibodies involved were anti-c (n = 27), anti-E (n = 6) and anti-K (n = 4), as well as one case each of anti-E + Fya, -C, -Fya and -Jka. Amniotic fluid was examined during pregnancy in nine cases, three children were given intra-uterine infusions, while in the remainder the haemolytic process was mild or only moderately severe. One infant died of toxoplasmosis, another one of immaturity and respiratory distress syndrome. Kernicterus was always prevented. In haemolytic disease of the newborn caused by anti-c and anti-E, prenatal damage is markedly rarer than with D erythroblastosis, but must be considered during the pregnancy. In anti-K haemolytic disease the severity of the disease is similar to that of D erythroblastosis. All three incompatibilities may lead to kernicterus in the first few days after birth so that exchange transfusions are often necessary. In most of the other incompatibilities the course is similar to that seen with ABO erythroblastosis.