The Veggie Patch brand Ultimate Meatless Burger is being pulled from store shelves in eastern and central Canada, amid concerns about possible Listeria contamination.

The affected product was sold in 1.02 kilogram packages throughout New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario and Quebec.

The products subject to the recall are marked with best before dates of Jan. 12th and Jan. 17th, 2013 and bear the UPC 6 10129 08477 7.

The Canadian Food Inspection Agency is monitoring the recall, which has been issued by the company that imported the burgers from the U.S., Costco Wholesale Canada Ltd.

In a health hazard alert issued Friday, the CFIA noted that there may not be any visible indication food is contamined with Listeria monocytogenes.

Eating contaminated food can nevertheless pose a significant health risk, particularly among pregnant women, the elederly and others with weakened immune systems.

Symptoms of the foodborne illness typically include high fever, severe headache, neck stiffness and nausea.

So far, however, the agency says there have been no reports of illness linked to the recalled burgers.