INDIANAPOLIS (AP) — Butler University in Indianapolis is requiring all students and employees to receive booster shots against mumps as it says nine students have been diagnosed with the disease.

Officials said Friday that four mumps cases have also been confirmed on the Indiana University campus in Bloomington and one at Indiana University-Purdue University Indianapolis.

A Butler spokesman says the ill students have been isolated and won’t return to campus activities until they’ve recovered. Butler and IU both reported their first cases last week.

The state health department says the Butler and IU outbreaks don’t appear connected.

Mumps symptoms include fever, headache, muscle aches and swollen and tender salivary glands. The virus can be spread it by coughing, sneezing, talking and other means.