Is the mumps vaccine safe?
It’s considered very safe. The MMR shot may give your child a fever or make him irritable for about 24 hours; this may often occur seven to ten days after receiving the vaccine. Redness at the injection site is also common. But allergic reactions to the vaccine occur in less than one in 100,000 injections (health care providers must report allergic reactions to the Food and Drug Administration). If your child is severely allergic to gelatin, the antibiotic neomycin, or has a severe immune disorder like AIDS, he shouldn’t get the vaccine. (Pregnant women shouldn’t get it either.
