The U.S. FDA has issued a high-risk recall for broccoli sold at Walmart due to potential Listeria monocytogenes contamination. This serious foodborne pathogen can cause life-threatening infections, especially in vulnerable groups.

The U.S. Food and Drug Administration has labeled the broccoli recall as a Class I, the highest risk level issued by the agency.

The U.S. Food and Drug Administration upgraded the classification of recalled broccoli sold at Walmart originally issued in December to its highest recall category, according to the agency’s updated report.

The recall announced in January involves contaminated broccoli sold in 20 states. Here's everything you need to know