coli outbreak associated with Wendy’s restaurants has infected 97 people in 6 states

Of the 67 people with local public health officials with a detailed food history, 81% reported having eaten at Wendy’s in the week before their illness began, according to the CDC.

“The true number of patients in this outbreak is likely to be higher than the number reported, and the outbreak may not be limited to states with known diseases,” the update said. “In addition, some people recover without medical care and are not tested for E. coli.”

CNN’s Kelly Murray also contributed to this story.