Walmart is recalling 12-ounce bags of Marketside Broccoli Florets sold in 20 U.S. states after a sample tested positive for listeria.

The recall affects bags sourced from Braga Fresh in Soledad, California, sold in over 1,000 stores across states like California, Texas, and Michigan.

The affected product has a UPC code of 6 81131 32884 5 and a lot code of BFFG327A6.

Although no illnesses have been reported, listeria can cause serious infections, especially in vulnerable groups, CBS News has reported.

Consumers are advised to dispose of the product. For questions, contact Braga Fresh at 877-456-7445.

Written by B.C. Begley