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.

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