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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2015-2016 Multistate Outbreak of E. coli O157 Linked to Dough Mix at Pizza Ranch

In 2016 public health officials investigated an outbreak of E. coli O157 linked to consumption of products made with contaminated dough mix. A total of 13 cases were reported by 9 states. Eight were hospitalized. There were no deaths. Illness onset dates ranged from December 6, 2015 to February 9, 2016. Nine of 12 persons interviewed reported eating at one of 9 locations of Restaurant A during the week preceding illness onset. Eight ate a specific dessert pizza made through a proprietary dough mix provided by manufacturer A. The ninth patient consumed bread sticks made from the same dough mix. Eighty-eight samples of dry dough mix from five restaurant A locations where patients reported eating were collected by public health officials in 5 states. The Minnesota Department of Agriculture identified non-0157 STEC in 17 collected samples, including one Shiga toxin-1-producing non-O157 STEC isolate and six Shiga toxin 2 (stx2)-producing non-O157 STEC isolates. FDA collected 6 samples of dry dough mix from manufacturer A. All six samples tested negative for STEC O157, but one yielded an stx2 producing STEC O8:H28. All identified strains lacked known adherence factors and were therefore considered to present low health risk.

  • Outbreak began:
  • December 2015
  • Affected Country:
  • US
  • Affected States/Territories:
  • Minnesota, Wisconsin, Iowa, North Carolina, South Dakota, Kansas, Illinois, Nebraska, New Jersey
  • Organism(s):
  • E. coli O157:H7
  • Vehicle(s):
  • pizza dough
  • Molecular Results Available:
  • Unknown
  • Test Results:
  • None
  • Location(s):
  • Restaurant
  • Brand Name(s):
  • Pizza Ranch
  • Product Subject to Recall:
  • No
  • Total ill:
  • 13
  • Number ill by Case Definition Known:
  • Unknown
  • Number Laboratory Confirmed Cases:
  • N/A
  • Number Probable Cases:
  • N/A
  • Number Possible Cases:
  • N/A
  • Anyone Hospitalized:
  • Yes
  • Number Hospitalized:
  • 8
  • Any Deaths:
  • No
  • Number Dead:
  • 0

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