Mumps, 2013

During 2013, no cases of confirmed mumps were reported, but there were 3 cases of probable mumps. Beginning in 2012, national case reporting criteria for mumps were revised. Confirmed cases must be laboratory-confirmed by PCR, and present with clinically compatible illness defined as acute parotitis or other salivary gland swelling lasting at least 2 days; aseptic meningitis, encephalitis, hearing loss, orchitis, oophoritis, mastitis, or pancreatitis. Probable cases are also reportable and require a positive mumps IgM antibody test result and/or epidemiologic linkage to another probable or confirmed case. Additionally, probable cases must present with clinically compatible illness defined as acute parotitis or other salivary gland swelling lasting at least 2 days; orchitis, or oophoritis.

All 3 of the probable cases of mumps were confirmed by IgM serology, and none were epidemiologically linked, demonstrating that asymptomatic infections are occurring, and suggesting that mumps is underdiagnosed. Cases ranged from 5 to 53 years of age. Two cases were fully vaccinated (with documentation of vaccination), and 1 had an unknown vaccination history but self-reported a history of disease.

• For up to date information see>> Mumps
• Full issue>> Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2013