In early January it was revealed that Walmart's washed and ready-to-eat 12 oz. Marketside Broccoli Florets were voluntarily recalled by Braga Fresh due to a possible contamination of Listeria monocytogenes. Although the item is no longer on shelves, consumers could still have bags in their freezer.

In late October, Brooklyn-based Acme Smoked Fish voluntarily recalled its smoked salmon sold under Costco's in-house brand Kirkland. At the time, laboratory testing of the smoked salmon confirmed the presence of L. monocytogenes, the bacteria that can lead to listeriosis.

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.

CDC officials exposure to listeria can cause of plethora of serious health problems, especially to children and elderly individuals who have weaker immune systems