Source: Morbidity and Mortality Weekly Report | Vol:Vol. 61 | Page: 986
On Sept. 29, 2011, the California Department of Public Health (CDPH) confirmed three cases of mumps among university students. An investigation conducted by the CDPH, student health services, and the local health department ultimately identified 29 mumps cases. The source was determined to be an unvaccinated student who had traveled to Western Europe, where mumps is circulating, and who had presented to his university’s student health services with symptoms of mumps. However, the student had shown symptoms more than 28 days before the onset of symptoms among the other patients, indicating at least two generations of transmission before authorities were alerted. The measles, mumps, and rubella vaccine was provided as a control measure for the outbreak. One of the 29 cases was a student with close contact to the source student, and another was a public health staff member who assisted during a mumps vaccination clinic. In the case of a mumps outbreak, the Centers for Disease Control and Prevention recommends that outbreak control include defining the at-risk population and transmission setting, and rapidly identifying and vaccinating persons who do not have evidence of immunity.