Four more cases of the mumps have been discovered at Harvard University.
Since Tuesday, six patients at the school have been diagnosed with the illness.
"These students have already been in isolation, and Harvard University Health Services (HUHS) continues to work closely with the Cambridge Public Health Department and the Massachusetts department of Public Health to investigate the scope of the exposure," wrote Paul Barreira, the health services director, in a statement.
The school reminds people to get fully vaccinated against the mumps and to practice good hygiene.
Officials ask anyone on campus experiencing swelling in the face or testicles, or pain in the jaw or ears, to call (617) 495-5711.