Shutterstock/Pj Aun Romaine lettuce that was grown near Yuma, Arizona, has been linked to an outbreak of a dangerous strain of E. coli. The CDC wants people to avoid all forms of romaine unless they are certain it didn't come from Arizona. Washing the greens is not enough to remove E. coli bacteria, according to a recent study. If you've got romaine lettuce in your refrigerator, throw it out — and then give the fridge a good scrub, ideally with bleach.