That's the message from the Centers for Disease Control and Prevention, after more than 50 people were sickened by eating E. coli-contaminated lettuce that came from the Yuma, Arizona, growing region.
If you have any store-bought romaine lettuce in your home, do not eat it. Throw it away, even if someone has eaten part of it and not gotten sick.
Yuma County is responsible for 90 percent of all leafy vegetables grown in the USA, from November to March, according to the county's Chamber of Commerce .
The warning includes whole heads and hearts of romaine, chopped romaine, and salads and salad mixes containing romaine lettuce, the CDC said.
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Forty-one (95%) of 43 people interviewed reported eating romaine lettuce in the week before their illness started.
The warning prompted several restaurants in Southern Arizona to stop selling salads temporarily, while others reported they have safe shipments of lettuce and are serving it.
Canadians can continue to use romaine lettuce in their salads, says the Public Health Agency of Canada. "If you or someone from your family recently ate romaine lettuce and are experiencing symptoms, please seek medical treatment immediately".
"No common grower, supplier, distributor, or brand has been identified at this time", the CDC said. The CDC said that investigation of the outbreak is ongoing.
This pathogenic bacteria produces compounds called Shiga toxins, which cause hemorrhagic colitis, which destroys the tissue lining the colon. If this infection is treated in the wrong way, with antibiotics, a complication called hemolytic uremic syndrome (HUS) can developed.
The current outbreak is not related to a recent multistate outbreak of E. coli O157:H7 infections from November to December 2017 linked to consumption of leafy greens. Of those infected with the E. coli strain, 31 people have been hospitalized.