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We see the Food and Drug Administration recommending the use of immune serum — then backtracking.

Faust says protection with a protein injection called immune serum globulin may be more appropriate.

Pregnant women, infants and people with weakened immune systems who are exposed to the virus may receive a protein injection called immune serum globulin within six days of exposure to prevent measles or reduce the symptoms, according to the Mayo Clinic.

Instead, health-care professionals try to prevent the disease by administering the MMR vaccine to children, and certain people who have been exposed, such as pregnant women, may be given a protein injection called immune serum globulin to try to thwart it or to lessen the symptoms, according to the Mayo Clinic.

The Mayo Clinic says that pregnant women, babies and people with weak immune systems can receive an injection of antibodies called immune serum globulin within six days of being exposed to measles, which might prevent or lessen the symptoms.