Six people from different four different households became ill after eating at a restaurant in Ramsey, Minnesota on November 20. The median incubation period for the cases was 36 hours (range, 23 to 62 hours). All six cases reported diarrhea. No cases visited a medical provider or were hospitalized.

The patrons reported eating a variety of different menu items. In an ingredient-specific univariate analysis, consuming both shredded cheese (6 of 6 cases vs. 2 of 6 controls; odds ratio [OR], undefined;
95% confidence interval [CI], undefined; p = 0.03) and chopped lettuce (6 of 6 cases vs. 2 of 6 controls; OR, undefined; 95% CI, undefined; p = 0.03) were significantly associated with illness. No other foods
were associated with illness.

Illness histories and job duty information were obtained from 26 restaurant employees. No employees reported having had gastrointestinal illness previous to or on the implicated meal date.