Despite high measles-mumps-rubella (MMR) vaccine coverage in the United States, several hundred cases of mumps are reported each year, including well-publicized outbreaks at universities in New York City and Ohio. However, sustained transmission is limited and occurs mainly in close-contact settings.

Photo courtesy of the CDC

Small mumps outbreaks continue to be reported in highly vaccinated U.S. communities.

Although the MMR vaccine is very effective, the protection is not complete (two doses of vaccine are about 88% effective at preventing mumps; one dose is about 78% effective). Small mumps outbreaks continue to be described in highly vaccinated U.S. communities, particularly in close-contact settings, such as universities, schools and camps. Rates of orchitis, the most common complication of mumps in post-pubertal males, are lower among people who receive two doses of MMR vaccine compared with unvaccinated people.

Mumps occurring in communities in the United States are a reminder of the importance...

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