Sixteen states have reported E. coli infections thus far. The source of the infection has not been identified, but the CDC said Wednesday that restaurants and retailers should stop serving salads and salad mixes with lettuce "from the Yuma, Ariz., growing region."
Throw out romaine lettuce, CDC advises as E. coli outbreak spreads
All store-bought romaine lettuce should be discarded because of a nationwide E. coli outbreak, the Centers for Disease Control and Prevention advised.