Kellogg k has issued a voluntary recall of one of its Eggo waffle products.

The company discovered through routine testing that some of its whole wheat Eggo waffles may be contaminated with Listeria monocytogenes. The recall notice, posted to the FDA’s website, states that the only Kellogg product affected is the 10 count box of Eggo Nutri-Grain Whole Wheat Waffles. The boxes included in the recall have best by dates of November 21 and November 22, 2017.

While listeria may only induce mild symptoms in most people, an infection can be serious for young children, the elderly, pregnant women, and those with otherwise weakened immune systems. At this point, no illnesses have been reported to the company in connection to this recall.

The products had been distributed to and sold in 25 states. Kellogg urges customers who have purchased the Eggo waffles specific to this recall to either throw them away or get in touch with the company to receive a full refund.

Kellogg could not immediately be reached for comment.