A single bad batch of spinach has prompted the Kroger company to recall of ten-ounce bags of the vegetable in 15 states.

The supplier, NewStar Fresh foods of California, says the recall is being done out of an abuncance of caution after a single package tested in Ohio yielded a positive result for Listeria.

No illnesses have been reported. Listeria can lead to severe illness for women who are pregnant or people who have a weakened immune system.

The Kroger Fresh Selections Tender Spinach was sold in 10-ounce bags and had a “best if used by” date of Sept. 16. It has a universal product code, or UPC, of 011110916495. The grocer said Wednesday that if customers did buy the recalled product, they should return it to stores for a full refund or replacement.

The Kroger Co., based in Cincinnati, said the product was sold in Missouri, Kansas, Nebraska, Ohio, Kentucky, West Virginia, Virginia, Georgia, Alabama, North Carolina, South Carolina, Tennessee, Michigan, Indiana, and Illinois. The recall involves its Kroger, Jay C, Owen’s, Pay Less, Scott’s, Food 4 Less, Dillons, Baker’s and Gerbes stores in selected states.