In the days leading up to Christmas, the Food and Drug Administration raised the red flag on some eggs distributed to Costco locations because of possible salmonella contamination.

The agency placed the affected eggs at the highest alert level 1 and reported that there was a “reasonable probability” that consumption of the eggs would “cause serious health consequences or death.”

Health officials identified the eggs as Handsome Brook Farms Kirkland brand Signature Organic Pasture Raised 24-Count Eggs, which were distributed to Costco locations in Tennessee, Alabama, Georgia, North Carolina and South Carolina.

As of November 22, approximately 10,800 retail units were distributed to 25 Costco stores.

The eggs were originally recalled just five days after distribution on November 27th, but the FDA renamed the product a Class 1 recall on December 20th.

“The recall was initiated after the company discovered that eggs not intended for retail use were instead packaged and distributed in retail packaging,” Handsome Brook Farms said in its Nov. 27 announcement. “Additional controls and retraining will be introduced in the supply chain to prevent a recurrence.”

The boxes in question have the Universal Product Code (UPC) 9661910680 and an expiration date of January 5, 2025.

The FDA noted that affected consumers should not consume this product and may return or discard the eggs to Costco for a full refund.

According to the Centers for Disease Control, symptoms of a salmonella infection include severe stomach cramps, nausea, diarrhea, vomiting, headaches and loss of appetite.

According to the CDC, symptoms typically begin between six hours and six days after infection and usually last four to seven days.

However, some people, especially children under 5 and adults 65 and older or those with weakened immune systems, may experience more severe illness that requires medical treatment or hospitalization, the CDC said.

Costco did not immediately respond to ABC News’ request for comment.