The Food and Drug Administration has raised the alert level on Costco’s recent egg recall over salmonella fears.

The FDA announced Monday that the recall is now “Class I,” meaning

This is the most serious level of risk an FDA recall can pose. The classification change comes a month after 10,800 retail units of organic eggs were recalled from Costcos in the southern United States.

According to the FDA, the eggs were in cartons of 24 with the Kirkland Signature logo. The product was recalled by Handsome Brook Farms in New York because “these eggs may be contaminated with salmonella.”

Salmonella is a bacteria that occurs in the intestines of animals and humans and can cause food poisoning. The foods most at risk are typically animal products such as raw meat, unpasteurized milk, undercooked poultry and eggs, but Salmonella can also contaminate fruits and vegetables through fertilizers used on crops.

The boxes included in the Handsome Brook Farms recall were sold at 25 Costco stores in Alabama, Georgia, North Carolina, South Carolina and Tennessee as of November 22nd. Units with Julian code 327 and an expiration date of January 5, 2025 are affected by the recall.

The FDA said in the news release that the recall was initiated after Handsome Brook officials discovered that eggs not intended for delivery to markets had been inadvertently packaged and distributed to retailers.

There are no known illnesses associated with the affected products. Consumers in possession of any of the affected cartons should return the eggs to their local Costco store for a full refund or discard the eggs.

Last year saw an unexplained increase in food recalls. Earlier this month, Frito-Lay recalled a “limited number” of Lay’s classic potato chips because they “may contain undeclared milk,” which Frito-Lay learned “after being alerted through a consumer contact.”

This poses a risk of a “serious or life-threatening allergic reaction” for customers who have “an allergy or severe hypersensitivity to milk.”

The FDA also recently issued a Class I recall of dog treats sold by Carolina Prime Pet, Inc. both online and in stores in 19 states. On November 22, approximately 400 bags of dog treats were recalled due to possible salmonella contamination.

In September, Lactaid milk was recalled in 27 states due to concerns about possible allergen contamination. That same month, a popular macaroni and cheese brand, Reser’s Fine Foods, recalled two products sold in five states over concerns about possible bacterial contamination.