Nearly two million pounds of ready-to-eat chicken products have been recalled due to concerns over bacteria, the USDA said Sunday.

National Steak and Poultry has recalled 1,976,089 pounds of poultry because the product is labeled “ready-to-eat” but may have been undercooked, and thus is at risk of containing dangerous bacteria.

Though no cases of illness have been reported, the items were shipped to food service locations nationwide and were sold directly to retail consumers, the USDA said.

The issue of possible contamination came to light after a customer complained to an establishment that their chicken appeared under-cooked.

The recall has been classified as a Class I recall by the USDA. A Class I recall is the most critical and involves a health hazard situation where there is reasonable probability that the use of the product will cause serious, adverse health consequences.

The products under recall include five-pound bags of product labeled “Distributed by National Steak and Poultry, Owasso, OK Fully Cooked, Diced, Grilled Boneless Chicken Breast Meat with Rib Meat” or labeled “Hormel Natural Choice 100% Natural No Preservatives Fully Cooked Roasted Chicken Breast Strips with Rib Meat Natural Smoke Flavor Added.” The former contains lot code 100416 and case code 70020; the latter contains lot code 100416 and case code 702113.

The recalled products were produced on various dates from Aug. 20, 2016 to Nov. 30, 2016. The cases containing the products subject to recall have the establishment number “P-6010T” inside the USDA mark of inspection, the USDA said.

Consumers who have purchased these products are urged not to consume or serve them. These products should be thrown away or returned to the place of purchase, the USDA said.

For more information about the recall, head to the USDA recall page.