When a mother’s immune system reacts to the fetus’ blood due to an incompatibility in blood cell type, it is called __________.

This is called Rh incompatibility, which can happen when a mother’s blood type is Rh-negative and the fetus’s is Rh-positive. The mother may form antibodies that react against the fetus’s red blood cells. Tremors, toxoplasmosis, and stillbirth are not names for this blood-type incompatibility.

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