PHILADELPHIA (FOX 29) - Philadelphia health officials believe 99 people have contracted mumps at Temple University.
Officials said Monday, there are 16 confirmed cases and 83 probable cases.
The latest increase has led to a petition that calls for the school to close until the outbreak can be contained.
Mumps is a viral infection that involves swelled glands. The Centers for Disease Control and Prevention say the measles-mumps-rubella (MMR) vaccine is the best way for people to protect themselves against it.
In an effort to combat the recent outbreak of mumps at Temple University that has reportedly affected dozens of students, the school has announced free mumps vaccine clinics Friday.
The clinics will be open next Wednesday, Mar. 27 and Friday, Mar. 29 from 9 a.m. to 4 p.m. in the Great Court at Mitten Hall on 1913 North Broad Street.
Students, faculty and staff will be eligible for free MMR (measles, mumps, rubella) vaccination.
"Mumps vaccine, given as MMR vaccine, is the best way to prevent infection," said the university in a press release.
"The two-dose series is usually given at one and four years of age, but immunity may wane over time. A third dose, or booster, of MMR vaccine can be given during mumps outbreaks to boost immunity and prevent continued transmission of disease."
The Associated Press contributed to this report.