Health officials say they have identified the cause of a foodborne-illness outbreak stemming from a Chipotlerestaurant in Powell, Ohio, that sickened at least 647 people.

Stool samples taken from customers who got sick after eating at the restaurant tested positive for Clostridium perfringens, a foodborne illness that occurs when food is left at an unsafe temperature, according to Traci Whittaker, a spokeswoman for the Delaware General Health District.

In response to the outbreak, Chipotle CEO Brian Niccol said: "Chipotle field leadership will be retraining all restaurant employees nationwide beginning next week on food safety and wellness protocols."

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