Many of the sick people said to have eaten Wendy's sandwiches which included romaine lettuce
The United States Centers for Disease Control and Prevention (CDC) has confirmed that it is probing an E.coli bacteria outbreak in four states from an unknown food source.
Many of the persons affected are reported to have had sandwiches at Wendy's Company.
The CDC said, of the 37 sick people, 22 were said to have consumed Wendy's sandwiches with romaine lettuce in Michigan, Ohio, Indiana and Pennsylvania in the week before they fell ill.
The investigators are yet to confirm if romaine lettuce is the cause however, nor have they said if the vegetable used in Wendy's sandwiches was served or sold at other businesses.
The burger chain said it is taking the precaution of removing sandwich lettuce from its restaurants in the region.
Nearly one thousand of roughly 5,940 Wendy's U.S. restaurants are located in the four states.
The illness reported started during the period July 26 to August 8.
A total of 10 people have been hospitalized, of whom three in Michigan have developed a type of kidney failure.
E.coli bacteria normally lives in the intestines of healthy people and animals.
Although many strains are harmless, certain types can cause severe abdominal cramps, bloody diarrhea and vomiting.
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