Snapshot A 26-year-old teacher presents to his primary care physician for a low-grade fever, swollen jaw, and painful testes. He teaches at an elementary school in Oregon, where many parents decline vaccination for their children. The patient immigrated from China when he was 5 and does not recall if he had been vaccinated prior to immigrating. On physical exam, he has right-sided swollen and tender parotid glands. His bilateral testes are also swollen and tender. He is prescribed antipyretics and analgesics and instructed to be isolated for at least 5 days. Introduction Classification login to view 6 more bullets Prevention login to view 2 more bullets Epidemiology Incidence login to view 2 more bullets Demographics login to view 1 more bullet Risk factors login to view 4 more bullets ETIOLOGY Pathogenesis login to view 4 more bullets Presentation Symptoms login to view 9 more bullets Physical exam login to view 6 more bullets Studies Labs login to view 2 more bullets Differential Epstein-Barr virus login to view 2 more bullets Acute bacterial parotitis DIAGNOSIS Making the diagnosis login to view 1 more bullet Treatment Management approach login to view 1 more bullet Conservative login to view 7 more bullets Complications Sterility in males who have orchitis after puberty Sensorineural deafness Acute bacterial parotitis Prognosis Patients infected with mumps virus are often asymptomatic