The CDC had previously warned consumers only about chopped romaine lettuce, but is now saying anyone who purchased any type of romaine lettuce from the Yuma, Arizona, region should throw it out.
"Based on new information, CDC is expanding its warning to consumers to cover all types of romaine lettuce from the Yuma, Arizona growing region," the CDC said in a statement. "This warning now includes whole heads and hearts of romaine lettuce, in addition to chopped romaine and salads and salad mixes containing romaine.
"Do not buy or eat romaine lettuce at a grocery store or restaurant unless you can confirm it is not from the Yuma, Arizona, growing region," it adds.
The warning was expanded on Friday after someone at a correctional facility in Alaska reported getting sick from whole heads of lettuce.
The CDC has not listed any brand or product names affected, just the location, saying "no common grower, supplier, distributor, or brand has been identified."
States which have reported illnesses include Alaska, Arizona, California, Connecticut, Idaho, Illinois, Louisiana, Michigan, Missouri, Montana, New Jersey, New York, Ohio, Pennsylvania, Virginian and Washington. Idaho and Pennsylvania have seen the most cases with 10 and 12, respectively.