The recall affects 12-ounce bags of the product, which were sold in 20 states and pose serious health risks if consumed.

Broccoli packages sold at Walmart stores in 20 states have received an elevated recall status over a Listeria contamination that has potentially fatal consequences.

When the FDA upgrades a recall, it's time to check your fridge or freezer for that particular product. This broccoli now poses a more serious Listeria risk.

A recall of bags of Braga Fresh broccoli florets has been revised and is now listed as a Class 1 recall, the highest level of risk the FDA issues.

Around the same time the U.S. Food and Drug Administration (FDA) updated Costco's Kirkland Signature Smoked Salmon recall to a Class I designation, the organization also updated Walmart's Marketside Broccoli Florets recall to Class I,