The agency classified the GreenWise organic blueberry and mixed berry recall as Class 1, the level reserved for products that may cause serious harm or death

Recalled frozen blueberries and mixed berries that could be contaminated with E. coli pose the most severe category of health risk, according to the FDA.

The agency classified the GreenWise organic blueberry and mixed berry recall as Class 1, the level reserved for products that may cause serious harm or death