Hundreds of frozen waffle products sold in Canada and the United States are being recalled after possible Listeria bacteria contamination was discovered at a facility in Ontario, according to the manufacturer.

TreeHouse Foods said Friday that it had conducted a voluntary recall after routine testing at its Brantford, Ont., manufacturing facility revealed possible contamination. It said the Canadian Food Inspection Agency (CFIA) and U.S. food regulators were aware of the recall.

The CFIA has not yet issued a recall alert, but there are brands sold in Canada on TreeHouse Foods’ list of recalled products, including No Name, sold in Loblaws and No Frills; Walmart’s Great Value brand, sold at Walmarts in Canada; Metro’s Selection brand, sold at Metro and Food Basics; and Compliments, sold at Sobeys, Foodland and FreshCo stores.

TreeHouse has published a complete list of affected products.

A listeria infection can be fatal

Listeriosis – the disease caused by a listeria infection – can cause vomiting, fever, headaches and diarrhea, among other symptoms. While cases can be mild, infections can also be serious or even fatal. According to the U.S. Centers for Disease Control, the disease is most dangerous for pregnant women, newborns, adults over 65 and people with weakened immune systems.

According to PHAC, approximately 134 cases of invasive listeriosis are reported annually in Canada.

TreeHouse said there were no confirmed reports of illnesses related to the waffles.

The company said consumers who own any of the products should discard them or return them to the store for credit.

Last year there were several cases of listeria contamination that led to recalls.

CFIA recalled some Silk and Great Value plant-based beverages this summer after the products were linked to a listeriosis outbreak. In Ontario, at least 20 people became ill and three people died.

In early October, a CFIA investigation into a foodborne illness outbreak led to the recall of a number of beef jelly tongue products.