Footnote

a Similar serums are used to treat a person bitten by a poisonous snake or a black widow spider. Also, in cases where there is an Rh incompatibility between a mother and her newborn child, doctors may urge her to accept a specialized serum injection. If the mother has not yet become sensitized to the child’s blood type, the serum (made from the blood of a woman who has already produced the antibodies) might be administered so her system does not produce antibodies that might adversely affect a future child.