CDC investigating lettuce at Wendy’s

The fast-food chain Wendy’s says it is pulling lettuce from sandwiches in its restaurants in Michigan, Ohio and Pennsylvania after people eating them there reported falling ill.

The Centers for Disease Control and Prevention said Friday it is trying to determine whether romaine lettuce is the source of an E. coli outbreak that has sickened at least 37 people and whether romaine used at Wendy’s was also served or sold at other businesses.

The CDC said there is no evidence that romaine sold in grocery stores is linked to the E. coli outbreak. The agency also said it is not advising people to stop eating at Wendy’s or not to eat romaine lettuce.