Produce supplier Braga Fresh has issued a ‘precautionary advisory’ about the product, which is no longer in stores but might still be in people’s freezers. The U.S. Food and Drug Administration (FDA) is alerting the public via its recall website about a voluntary advisory issued by Braga Fresh for a batch of Marketside Broccoli Florets sold at Walmart stores across 20 states.

Wal-mart has issued a recall of the 12-ounce bags in 20 states after testing uncovered listeria bacteria in one sample.