Last week Food Safety Tech reported on a multi-agency investigation of an E.coli O157:H7 outbreak linked to chopped romaine lettuce from Yuma, Arizona.

Now the CDC is advising consumers, restaurants and retailers to get rid of all romaine lettuce—not just chopped romaine, but also whole heads and hearts of romaine, and salads and salad mixes containing the variety—if they cannot confirm the source. “Information collected to date indicates that romaine lettuce from the Yuma, Arizona growing region could be contaminated with E. coli O157:H7 and could make people sick,” the CDC states on its website.

The most current illness case count is 53, with illnesses reported in 16 states. There have been 31 hospitalizations thus far and no deaths, according to the CDC.