The FDA classified a November recall over potential salmonella contamination for eggs sold at Costco at its highest risk level.

Nearly a month after a five-state recall of eggs sold at Costco, the FDA now says consumption of the recalled eggs could "cause serious adverse health consequences or death."

A recall on eggs from a New York-based farm sold at Costco stores been raised to the highest risk level due to the risk of severe illness or even death stemming from possible salmonella exposure, federal food regulators said.