More than 100 cases of E. coli have been reported in the Midwest and one case has been reported in New York.
97 people have been affected by the outbreak so far in six states, according to the CDC. Two states are new to the list.
A specific food has not yet been confirmed as the source of this outbreak, but many sick people reported eating burgers and sandwiches with romaine lettuce at Wendy's before they got sick.
According to the CDC, 43 people have been hospitalized as a result of the outbreak and 10 have developed hemolytic uremic syndrome, a serious and rare condition that can lead to death.
The CDC said there have been no deaths.
"The true number of sick people in this outbreak is likely higher than the number reported, and the outbreak may not be limited to the states with known illnesses," the CDC said.
There are many lawsuits against Wendy's.
36 people have been represented by Marler Clark in six lawsuits against Wendy's and its lettuce supplier.
There were two complaints in Michigan.
Four days after eating a burger at Wendy's, a woman in Michigan started to experience symptoms of E. coli. She was in the hospital for a while.
Another lawsuit says that an Ohio resident was hospitalized after eating a burger.
There will be more lawsuits in the coming days.
Wendy's didn't respond immediately to Insider's request for comment.
According to the CDC, 81% of the people it has collected detailed food history for had eaten at Wendy's in the week before they got sick. The people who were sick had eaten a variety of menu items.
The E. coli outbreak has been linked to 58 people in Michigan, 24 in Ohio, 11 in Indiana, two in Pennsylvania, and one in Kentucky and New York. The people are between three and 94 years old.
According to the CDC, Wendy's has removed lettuce from sandwiches in the area.
There is no evidence that Wendy's use of a different type of lettuce is related to the outbreak.