A broccoli product sold at Walmart in Michigan was under recall. Now the FDA says the product may be considered deadly. Here's what to know.

Bags of broccoli florets that were sold at Walmart stores in 20 states are affected by a Class I recall due to concerns over possible listeria contamination.

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