The Food and Drug Administration (FDA) this week reclassified its recall of 13-ounce bags of Frito-Lay potato chips to the highest level, over concerns that the bags could contain undeclared milk and be potentially fatal.

The FDA initially recalled a select number of 13-ounce bags that were distributed in Washington and Oregon last month. Milk is considered one of the agency's eight “major food allergens," which can trigger serious allergic reactions in sensitive individuals, including hives, cramps, dizziness, swollen vocal cords, and unconsciousness.

“Those with an allergy or severe sensitivity to milk run the risk of a serious or life-threatening allergic reaction if they consume the recalled product,” the FDA said in its initial notice on Dec. 16.

Frito-Lay said that no consumer has reported an allergic reaction to the potentially contaminated bags, and that no other chips were impacted by the recall. But those who did purchase a 13-oz bag of Frito-Lay potato chips that was affected by the recall should discard the packages.

The affected chips can be identified by a “guaranteed fresh” date of Feb. 11 and a manufacturing code of either “6462307xx” or “6463307xx," according to the New York Post.

The Frito-Lay recall is just the latest in a string of recalls that the FDA has ordered due to undeclared milk and other allergens. The agency has also issued recalls for NuGo Granola Bars, Pearl Milling Company Pancake & Waffle Mix, New York Mutual Trading Co. Monkfish Liver, and Monkey Spit Barbecue Sauces, among others.