How did the discovery of the rhesus factor affect society?

The rhesus (Rh) factor is an antigen on red blood cells. Recognizing Rh incompatibility made it possible to identify pregnancies in which an Rh-negative mother could develop antibodies that harm an Rh-positive developing child. Treatments such as anti-D immunoglobulin can prevent this harm, so the correct choice is “New treatments during pregnancy could prevent harm to the developing child.”

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