"Talk to your doctor if you have symptoms of an E. coli infection and report your illness to your local health department", the agency said. "No common grower, supplier, distributor, or brand has been identified", the department reported on April 20.
Nine people in the current outbreak have developed hemolytic uremic syndrome (HUS), the form of kidney failure that can turn E. coli into a killing disease. Fortunately, no deaths have been reported. It includes whole heads and hearts of romaine, chopped romaine and salad mixes.
In its warning, the CDC said that unless the source of the product is known, consumers anywhere in the United States who have any store-brought romaine lettuce at home should not eat it and should throw it away.
Mary Stringini is a Digital Producer for ABC Action News.
-Do not eat or buy romaine lettuce unless you can confirm it is not from the Yuma, Arizona, growing region. She said that case remains under investigation.
Clark says his law firm has gotten calls from many people who've claimed they've gotten sick from this outbreak.
The illnesses have been identified as linked to a particularly virulent strain of E. coli O157:H7.
Meijer and Kroger say they're selling romaine lettuce that's safe to eat.
"If it's a chopped product like romaine, the bacteria can get in the ends of the cut lettuce and thrive there", said Clark.
Restaurants and retailers should ask their suppliers about the source of their romaine lettuce.
The sweeping advisory came after information tied to some new illnesses prompted health officials to caution against eating all kinds of romaine lettuce that came from Yuma, where the outbreak began.
Illnesses include 12 cases in Pennsylvania, 10 cases in Idaho, seven cases in New Jersey, six cases in Montana, three cases in Arizona, two each in Connecticut, Michigan, New York and OH, and one case each in Alaska, California, Illinois, Louisiana, Missouri, Virginia and Washington. "If you or someone from your family recently ate romaine lettuce and are experiencing symptoms, please seek medical treatment immediately". Those most at risk for E. coli illness include the very young, the very old and individuals with compromised immune systems.