Authorities are scrambling after discovering that certain types of frozen pizzas may contain a potentially deadly disease. The U.S. Department of Agriculture has issued a statement warning that RBR Meat Company is recalling 21,220 pounds of frozen pizza product that may have been contaminated with Listeria monocytogenes.

The surpreme frozen pizza item in question had a production date of Feb. 23, and is marketed under the following label: “Marketside Extra Large Supreme Pizza,” lot code 20547. The item was shipped to distribution centers in Washington, Utah, Nevada, and California.

Authorities discovered the Listeria during routine sampling. So far, there haven’t been any confirmed reports of bad reactions to the pizzas, but authorities are taking the action out of an abundance of caution. Listeria infections can result in serious complications for those with weakened immune systems or pregnant women.

The USDA states: “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.”