But this recall is not part of a current CDC investigation of two separate E. coli outbreaks, Katzowitz says. The agency has not yet identified a specific food involved in those outbreaks, which have sickened 44 people in 13 states. However, the bacterial strains causing the illnesses are genetically related to strains that caused previous E. coli outbreaks linked to romaine lettuce.
People can become infected with E.coli two to eight days after exposure. The symptoms are stomach cramping, diarrhea, vomiting, and sometimes a mild fever, and they generally last five to seven days. In some people, toxin-producing E.coli, such as the O157:H7 strain that contaminated the lettuce involved in this recall, can lead to kidney failure and death.
Contaminated romaine lettuce and other leafy greens have been linked to 46 multi-state E. coli outbreaks between 2006 to 2019, according to the CDC.
One likely way E.coli can spread lettuce is via irrigation water that is contaminated with fecal matter from cattle that graze nearby, says James E. Rogers, PhD, director of Food Safety Research & Testing at Consumer Reports. Cattle can carry this specific E. coli strain in their guts, but it doesn’t make them sick.
A small amount of E. coli can contaminate large batches of leafy greens during the washing phase of production, Rogers says.
“By the time growers combine multiple batches of lettuce, mix it around, rinse it and wash it, that little bit of bacteria may spread over a lot of lettuce,” Rogers says. “And, you can't wash or rinse E.coli off,” he adds. “it's just impossible.”
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Romaine Lettuce Sold at Walmart Recalled Due to E.Coli Risk - ConsumerReports.org
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