Foodborne Illness Outbreak Database

This database provides summaries of significant food and water related outbreaks occurring since 1984 caused by E. coli, Salmonella, Hepatitis A, Campylobacter and other pathogens. Read more »

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2012 Outbreak of Norovirus Associated with a Restaurant in Woodbury, Minnesota

In March 2012 staff at the Minnesota Department of Health (MDH) and Washington County Public Health and Environment (WCPHE) investigated an outbreak of norovirus among patrons of a restaurant located in Woodbury, Minnesota. Implicated meal dates occurred on March 9 and March 10. A total of 32 restaurant patrons were interviewed. Nine patrons met the case definition, including three cases from separate households. The median incubation period was 28.5 hours (range, 20 to 50 hours). The median duration of illness for the three cases who had recovered at the time of interview was 44 hours (range, 11 to 58 hours). No cases sought medical care and no one died. Four case stool specimens tested positive for norovirus at the MDH Public Health Laboratory. Three stool samples (two from one complainant household wo ate at the restaurant on March 9, and one who ate at the restaurant on March 10 tested positive for norovirus GII.1 with identical region D nucleic acid sequences. The fourth specimen, from an individual from a separate household who ate at the restaurant on March 10 was positive for norovirus Gii.4 New Orleans. By univariate analysis, eating an entrée that contained fresh lettuce ( 7 of 9 cases vs. 4 of 19 controls; odds ratio 13.1; 95% confidence interval, 1.9 to 89.5; p=0.01) was statistically associated with illness. All employees were interviewed. None reported recent illness. An incomplete and inaccurate employee contact list hindered the employee interview process. Investigators concluded this was an outbreak of norovirus associated with a restaurant in Woodbury. Eating lettuce at the restaurant was significantly associated with illness. No illness in employees or employee family members was reported.

  • Outbreak began:
  • March 2012
  • Affected Country:
  • US
  • Affected States/Territories:
  • Minnesota
  • Organism(s):
  • Norovirus
  • Vehicle(s):
  • Lettuce
  • Molecular Results Available:
  • Yes
  • Test Results:
  • GII.1, GII.4 New Orleans
  • Location(s):
  • Restaurant
  • Brand Name(s):
  • Product Subject to Recall:
  • No
  • Total ill:
  • 9
  • Number ill by Case Definition Known:
  • Yes
  • Number Laboratory Confirmed Cases:
  • 4
  • Number Probable Cases:
  • 5
  • Number Possible Cases:
  • 0
  • Anyone Hospitalized:
  • No
  • Number Hospitalized:
  • 0
  • Any Deaths:
  • No
  • Number Dead:
  • 0
  • Any References:
  • No

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