In January 2011, public health officials investigated an outbreak of norovirus among persons who attended a workshop on January 12 at a restaurant in Morris, Minnesota. There were 9 workshop staff and 32 workshop attendees. Twenty-two (73%) met the case definition. One person was hospitalized. No one died. Three stool samples were submitted for testing and one tested positive for norovirus GI.

No specific food vehicle was identified. The source of the contamination likely was one or more of the several food workers who had recent gastrointestinal illness and worked on January 12.