Hundreds of frozen waffle products sold at leading retailers, including Walmart and Target, are being recalled due to possible contamination with listeria bacteria, the manufacturer said.

TreeHouse Foods said Friday it has issued a voluntary recall after discovering possible contamination during route testing at its plant. It says the U.S. Food and Drug Administration and Canadian food regulators are aware of the recall.

Listeria infections can cause mild illness, including fever and diarrhea, or more serious problems. The disease is most dangerous for pregnant women, newborns, adults over 65 and people with weakened immune systems, according to the U.S. Centers for Disease Control.

CDC estimates that 1,600 people are infected with listeria each year in the United States 260 die.

The recalled waffles are sold under various names, including Walmart’s Great Value, Target’s Good & Gather and private label brands sold by Food Lion, Kroger and Schnucks. Treehouse published a complete list.

TreeHouse said there have been no confirmed reports of illness linked to the waffles.

The company said consumers who have any of the products in their possession should throw them away or return them to the store for credit.