MMR vaccinations are given by injection in two doses. Some states require a second MMR at kindergarten entry. Measles, mumps, and rubella are infections that can lead to significant illness. More than 90 percent of children receiving MMR will be protected from the three diseases throughout their lives. The second MMR is recommended for adequate lifelong immunity.
Serious problems are rare.
Potential mild to moderate adverse effects, also rare, include rash, fever, and mild joint pain. If your child is ill with anything more serious than a cold, immunization should be delayed. If your child has an allergy to eggs or to the antibiotic neomycin that has required medical treatment. If your child has received gamma globulin within the past three months. If a rash develops without other symptoms, no treatment is necessary and it should resolve within several days.