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

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.

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.

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,