A proposed class action lawsuit was filed earlier this week against McDonald’s over an E. coli outbreak linked to Quarter Pounders.

NBC News Reports The lawsuit seeks damages for customers who purchased the burgers and alleges that the chain failed to “adequately disclose that there was an E. coli risk associated with its menu items.”

The lawsuit needs court certification to proceed as a class action.

Reuters reports the lawsuit, filed in federal court in Chicago, seeks unspecified damages in excess of $5 million for all people who purchased the contaminated sandwiches.

Earlier this month, dozens of people in about 13 states, mainly in the Southwest and Midwest, fell ill and at least one person died as part of the outbreak. He The Centers for Disease Control and Prevention said The source of the contamination was related to the raw chopped onions in the burgers.

According to NBCRoy Willey, an attorney representing the plaintiffs, said: “McDonald’s has a responsibility to source its products to serve others from secure facilities. If they cannot guarantee it, then they have the responsibility to warn: “maybe this product may be dangerous.”

He added that consumers would not pay for hamburgers if they knew they were contaminated.

The lawsuit, filed on behalf of Amanda McCray of Chicago and William Michael Kraft of Davie, Florida, who according to NBC purchased the burgers and experienced symptoms associated with an E. coli infection.

Several consumers have filed separate lawsuits against McDonald’s for claiming they became ill. McDonald’s reportedly did not respond to a request for comment.

McDonald’s resumed selling the burger after removing the menu item at approximately 900 locations. The onions came from the Taylor Farms facility in Colorado Springs.