In December 2017, four people from different households who ate at a restaurant located in the Longfellow neighborhood of Minneapolis. The meal date was December 17. Cases reported eating a variety of items from the menu. No food item was significantly associated with illness.

Minneapolis Health Department sanitarians visited the restaurant to conduct an environmental assessment, provide norovirus interventions, initiate employee illness screening, and interview restaurant employees. Seven of 55 employees reported recent gastrointestinal illness, with symptoms including diarrhea, vomiting nausea, stomach cramping, and/or fever. Onset dates for these illnesses ranged from December 6 to January 1, 2018. One employee reported working while symptomatic. No employee submitted a stool specimen.

While an etiology was not laboratory confirmed, the incubation periods and symptoms, were most characteristic of norovirus. A specific outbreak vehicle was not identified, but the source of the outbreak likely was one or more ill or recently ill food workers.