The U.S. Food and Drug Administration has upgraded the product recall for Lay's Classic Potato Chips to the highest risk level for a batch that may contain undeclared milk ingredients.

In December, Frito-Lay issued a recall warning that select 13-ounce bags may contain undeclared milk posing a risk of a serious or life-threatening allergic reaction. On Monday, the FDA classified the recall as "Class I," the most severe risk level, reported USA TODAY.

"Those with an allergy or severe sensitivity to milk run the risk of a serious or life-threatening allergic reaction if they consumed the recalled product," said the FDA in their initial recall report.

The FDA classifies recalls into three categories (I, II, or III) to indicate the degree of a health hazard presented by a product.

Is Tennessee among the states affected in the Lays recall?

No, according to the recall the bags of chips were distributed to “certain retail stores and e-commerce distributors" in Oregon and Washington.

Contributing: USA TODAY

Diana Leyva covers trending news and service journalism for The Tennessean. Contact her at [email protected] or follow her on X, the platform formerly known as Twitter, at @_leyvadiana

This article originally appeared on Nashville Tennessean: Lay's potato chips recall: Is Tennessee affected amid Class I recall