WEST DES MOINES, Iowa (AP) — Hy-Vee Inc. says it is recalling Hy-Vee Summer Fresh Pasta because of a potential listeria contamination.

The West Des Moines-based grocer said Tuesday that the company has learned that frozen vegetables in the salad could be contaminated with the bacterium Listeria monocytogenes.

The company sold the salad from April 9 to April 27. Hy-Vee has pulled the salad from stores in Illinois, Iowa, Minnesota, Missouri, Nebraska and South Dakota.

Hy-Vee says people who bought the pasta salad between those dates should dispose of it or return it for a refund.

The company says there are no known listeria infections linked to the recall.

Listeria generally only affects the elderly, people with compromised immune systems and pregnant women. It can cause fever, muscle aches, gastrointestinal symptoms and even death.