During 2014, 22 cases of mumps were reported. Nine (41%) were classified as confirmed (tested positive by PCR) and 13 (59%) as probable (tested positive by IgM serology or were epidemiologically-linked to a probable or confirmed case).
Seven (32%) cases were students returning to Minnesota from colleges where mumps outbreaks were occurring. After they returned, no transmission was reported within Minnesota. Another 7 cases were related to an outbreak occurring among multiple National Hockey League teams including the Minnesota Wild. Five Minnesota Wild players contracted mumps in addition to two health care workers who had face-to-face contact with the players. Two (9%) cases acquired mumps while travelling internationally, and the remaining 6 (27%) cases were classified as probable and were not epidemiologically linked or associated with outbreaks occurring elsewhere.
Cases ranged in age from 1 to 53 years. Three cases occurred in persons under 18 years of age; 13 cases occurred in persons 19 through 33 years of age; 5 cases occurred in persons 34 through 49 years of age; and 1 case occurred in a person 50 years and older. Five cases had a documented history of 2 doses of mumps-containing vaccine; 3 cases had a documented history of 1 dose. Nine cases reported a history of receiving at least 1 dose of mumps-containing vaccine but had no documentation of those doses. Five cases reported never having received any doses of mumps-containing vaccine. No cases reported a previous history of mumps disease.
Mumps surveillance was complicated this year by a large number of individuals with parotitis tested negative for mumps by PCR but positive for influenza A in viral culture. While parotitis is a known symptom of influenza, it is uncommon.
- For up to date information see>> Mumps
- Full issue>> Annual Summary of Communicable Diseases Reported to the Minnesota Department of Health, 2014