In late January 2020, members of multiple dining parties became ill with norovirus associated with eating a build-your-own pizza at a restaurant in Bloomington, Minnesota. Eleven outbreak associated cases were identified. No one was hospitalized and no one died. One case submitted a stool sample to the Minnesota Department of Health Public Health Laboratory, where it tested positive for norovirus GII.4 Sydney[P16].

In univariate analysis, consumption of the pizza was significantly associated with illness (10 of 11 cases vs. 46 of 114 controls, odds ratio 14.8; 95% confidence interval 1.8 to 119.4; p=0.002).

City of Bloomington Environmental Health (CBEH) sanitarians conducted an environmental assessment at the restaurant on February 5. Violations identified during this assessment included: absence of personal protective equipment for employees used when cleaning and sanitizing vomit and diarrheal incidents; low concentrations of quaternary ammonium compounds in sanitizer buckets; unlabeled spray bottle of sanitizer, inadequate cleaning of sinks in employee bathrooms, garbage cans, under the dishwasher, and door to employee men's bathroom. The sanitarians did not note any problems with handwashing, glove use, and bare-hand contact with ready-to-eat foods.