Mumps Outbreak in a Vaccinated Population

Mumps is an acute viral infection affecting primarily parotid and other salivary glands. Vaccination has reduced the incidence to 0.1 case per 100,000 population annually in the U.S. Formerly a childhood disease with few sequelae, the rare mumps cases now typically occur in young adults and carry increased complications including orchitis, oophoritis, and aseptic meningitis. Outbreaks involving this population occur sporadically, especially in congregate communities.

This report describes a mumps outbreak at a university in New York City, where mumps is a reportable disease. The index case, involving unilateral parotitis in a university student, was reported on January 12, 2014. Mumps serology was negative, and a mumps diagnosis was thereby …