Romaine lettuce sandwiches causing several serious infections in the United States? The famous chain of American restaurants Wendy’s could be at the heart of an epidemic of contamination with the bacterium Escherichia coli. According to the Centers for Disease Control and Prevention (CDC), 37 people said they were sick, and 10 others required hospitalization in four different US states after visiting one of the chain’s establishments. No deaths have been reported.

As detailed by the American channel CNN, the source of the epidemic has not yet been determined, but many sick people have said they have eaten sandwiches made with romaine lettuce at Wendy’s restaurants. Michigan, Ohio and Pennsylvania before falling ill. The contaminations were observed between July 26 and August 8.