Someone on the Evanston campus has been diagnosed with a laboratory-confirmed case of mumps, according to the Northwestern University Health Service.

The announcement came a day after the Evanston Health Department said it had received a report from the Illinois Department of Public Health of a laboratory-confirmed case of mumps involving a “Chicago area university student.”

“The student attended classes and events during the infectious period potentially exposing others,” the EHD said in a news release.

Due to the viral illness’s incubation period, the department believes secondary cases could surface as late as June 27.

Mumps is transferred by saliva or mucus from the mouth, nose or throat of an infected person, according to the Health Service. Anyone who has a vaccination against mumps is highly unlikely to contract it.

Symptoms of mumps include fever, headache, muscle aches, exhaustion, loss of appetite, and swollen and tender salivary glands under the ears, according to the health department. Some people who are infected do not exhibit any symptoms, making mumps more difficult to detect.

“We request that all local healthcare providers and local networks of physicians be on the lookout for anyone with symptoms suggestive of mumps,” Evanston health director Evonda Thomas-Smith said in the release. “If patients present with any of the symptoms, we are requesting immediate notification to the Evanston Health Department.”

The department’s Communicable Disease Section can be reached at 847-866-2962.

— Patrick Svitek