The Oregonian reported Wednesday (http://bit.ly/1h9tjJ3 ) that the items were produced at Reser's Fine Foods' plant in Topeka, Kan., and were distributed across the U.S. and in Canada.
According to the U.S. Department of Agriculture, the listeria was detected through microbiological testing by Canadian health authorities. U.S. officials traced the contamination to the Kansas plant.
The Beaverton, Ore., company says the Food and Drug Administration found listeria in the plant and there's a possibility that items became cross-contaminated.
A list of the recalled products can be found at the FDA's website, http://1.usa.gov/1cYFy8A . They all have a plant identifier code of "20" after the use-by date.
Reser's has also set up a hotline at 1-888-257-7913.
Information from: The Oregonian, http://www.oregonlive.com