BEAVERTON, Ore. — A Food and Drug Administration spokeswoman says a recall of packaged salads, produced at its plant in Kansas, was prompted by a routine check of products sold in Canada.

FDA spokeswoman Juli Ann Putnam said Tuesday that the Canadian Food Inspection Agency found Listeria monocytogenes in some ready-to-eat macaroni and cheese and Reser’s did a voluntary recall.

Putnam says a follow-up inspection of the plant by the Food and Drug Administration and the state of Kansas determined there was a potential for cross-contamination with other products, so the recall was expanded.

In all, some 450 products
were recalled.

Listeria can produce fever, headache, diarrhea and abdominal pain, and can be fatal for people with weak immune systems.