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News From the Centers for Disease Control and Prevention
September 11, 2018

Mumps Outbreak Preparedness

JAMA. 2018;320(10):966. doi:10.1001/jama.2018.12455

A 2016 outbreak of mumps at 4 Indiana universities that eventually led to 281 cases revealed important gaps in vaccination record keeping and the need for better outbreak response plans at universities, according to a CDC report.

The United States has seen substantial increases in mumps cases since 2014—including cases among vaccinated individuals—and 2016 saw the highest number of cases (6366) in a decade, according to the authors. The outbreaks at the 4 Indiana universities took place between January and September of that year. Nearly 64% of mumps cases occurred among students and staff. Individuals living near the univerisity accounted for 36.3% of cases, and only 25.5% of these cases had documented links to infected individuals at the university. Documentation of having received 2 doses of the measles-mumps-rubella (MMR) vaccine was available for 84.9% of the university cases and 52% of the community cases. Twelve individuals had documentation for 3 doses of MMR at least 4 weeks before symptoms developed. Six individuals developed mumps complications despite having received 2 doses of MMR.

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