CDC: Vaccines prevent millions of illnesses, but measles makes a return

The researchers also recommend that all residents of the United States born after 1956 make sure they have received the MMR vaccine "or have serologic evidence of measles immunity."

If individuals do not have serologic evidence of immunity and are traveling outside of North America or South America, the CDC recommends one dose of MMR vaccine for infants aged 6-11 months, and two doses of MMR vaccine at least 28 days apart in children aged 1 year and older, and in adults.

There were no author disclosures for either report.