Philadelphia health officials say they've now believe 67 people have contracted mumps at Temple University.

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City Department of Health spokesman James Garrow said Tuesday the total number of probable cases stands at 67 — up from 54 cases a day before. WCAU-TV reports health officials confirmed 12 cases through laboratory testing while 55 others were listed as probable.

Probable diagnoses are used in cases where a person in the community shows mumps-like symptoms.

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Health officials recommend students who may be infected limit contact with others for at least five days and seek medical care.

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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.