RBR Meat Company Inc., located in Vernon, CA, has recalled  approximately 21,220 pounds of frozen pizza product sold at Walmart  that may be adulterated with Listeria monocytogenes, according to the U.S. Department of Agriculture’s Food Safety and Inspection Service (FSIS).

The supreme frozen pizza item was produced on Feb. 23, 2017. The recalled products include:

• 50.6-oz. corrugated box containing 1 shrink wrapped 16” pizza labeled as “Marketside Extra Large Supreme Pizza,” with lot code 20547.

The pizzas subject to recall bear establishment number “EST. 1821” inside the USDA mark of inspection. These items were shipped to retail distribution centers in California, Nevada, Utah and Washington.

The problem was discovered during routine sampling by the firm. There’s not yet  been any  confirmed reports of adverse reactions due to consumption of these products.

Consumption of food contaminated with L. monocytogenes can cause listeriosis, a serious infection that primarily affects older adults, persons with weakened immune systems, and pregnant women and their newborns. Less commonly, persons outside these risk groups are affected.

Listeriosis can cause fever, muscle aches, headache, stiff neck, confusion, loss of balance and convulsions sometimes preceded by diarrhea or other gastrointestinal symptoms. An invasive infection spreads beyond the gastrointestinal tract.

In pregnant women, the infection can cause miscarriages, stillbirths, premature delivery or life-threatening infection of the newborn. In addition, serious and sometimes fatal infections in older adults and persons with weakened immune systems. Listeriosis is treated with antibiotics. Persons in the higher-risk categories who experience flu-like symptoms within two months after eating contaminated food should seek medical care and tell the health care provider about eating the contaminated food.

FSIS and the company are concerned that some product may be frozen and in consumers’ freezers.

Consumers who have purchased this product are urged not to consume it. This product should be thrown away or returned to the place of purchase.

FSIS routinely conducts recall effectiveness checks to verify recalling firms notify their customers of the recall and that steps are taken to make certain that the product is no longer available to consumers. When available, the retail distribution list(s) will be posted on the FSIS website.