A leading vegetable supplier in California, Mann Packing, voluntarily recalled products that might have been contaminated with Listeria.

The recall affects packaged produce at multiple supermarkets across the United States and Canada including Walmart, Whole Foods, Trader Joe’s, Meijer, Albertson’s and Safeway.

“Mann Packing is issuing this recall out of an abundance of caution,” the company said in a statement, adding that it is cooperating with U.S. and Canadian health officials to recall the products.

No illnesses have been linked to the products, the company said. The contamination risk was picked up by the Canadian Food Inspection Agency through random sampling.

The affected items were listed as “best if used by” October 11 to October 20.

About 1,600 people become infected with listeria each year, and about 260 die, according to the U.S. Centers for Disease Control and Prevention.