Minnesota Department of Health officials investigated reports of illnesses among people who ate lunch at a church following a funeral held on April 30, 2011. Illness histories and exposure information was obtained from 61 attendees. Thirty-one met the case definition for an outbreak associated case. Seventeen (57%) of 30 food helpers were interviewed, and none reported illness prior to the funeral luncheon. However, seven (23%) food helpers reported illness afterward and met the case definition. The majority of food helpers also attended the funeral and ate at the luncheon. Illness onsets ranged from April 30 to May 5.

Caesar salad and potato salad were identified as the vehicles of transmission. While no food helpers reported illness prior to the luncheon, many food helpers were not interviewed, and contamination by one of more unidentified ill food helpers is the most plausible source of contamination.