FDA upgrades recall of frozen berries to highest-risk warning

The Food and Drug Administration has upgraded a recall of frozen blueberries and mixed berries to its highest-level risk warning.

Last month, Publix grocery stores recalled all lots of GreenWise Organic Whole Blueberries and Whole Mixed Berries because of potential E. coli contamination, which can cause stomach cramps, diarrhea and vomiting, and in some cases more serious complications.