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Multi-state Outbreak of E. coli O157:H7 (STEC O157)

*This outbreak appears to be over as of June 28, 2018.

The CDC identified a multi-state outbreak of Shiga toxin-producing Escherichia coli O157:H7 (STEC O157) infections, with a total of 210 cases from 36 states. Based on epidemiologic, laboratory, and traceback evidence, romaine lettuce from the Yuma growing region was the likely source of this outbreak.

DPHHS HAN advisory: Multi-state outbreak of STEC O157, including Montana

DPHHS Press Release

STEC O157 in Montana

Montana had nine confirmed cases of STEC O157 as part of this national outbreak. The nine confirmed cases were in Flathead (3), Missoula (3), Lincoln (1), Yellowstone (1) and Ravalli (1) counties. The nine Montana cases have an age distribution between 31 and 85, with illness onset dates between 3/28 and 4/16.

* confirmed cases linked to the multi-state outbreak

CDC Advice to Consumers

  • Do not buy or eat romaine lettuce at a grocery store or restaurant unless you can confirm it is not from the Yuma, Arizona, growing region.
  • Unless the source of the product is known, consumers anywhere in the United States who have any store-bought romaine lettuce at home should not eat it and should throw it away, even if some of it was eaten and no one has gotten sick. Product labels often do not identify growing regions; so, throw out any romaine lettuce if you’re uncertain about where it was grown. This includes whole heads and hearts of romaine, chopped romaine, and salads and salad mixes containing romaine lettuce. If you do not know if the lettuce is romaine, do not eat it and throw it away.

For more information on the multi-state outbreak, please visit the CDC investigation page for this outbreak.

Please visit the CDC E. coli page for additional information on the bacteria and how to prevent disease.

*This page will be updated by the close of business every week day.