Amid fears of a new food poisoning outbreak, the Centers for Disease Control and Prevention (CDC) urged all Americans to throw out all romaine lettuce just two days before Thanksgiving.

The announcement came Tuesday as the CDC announced that they're working to learn more about the possible health risks from eating the lettuce. All restaurants were urged to not sell romaine lettuce, and consumers should act quickly if they feel they have symptoms of an E. coli infection.

"Consumers who have any type of romaine lettuce in their home should not eat it and should throw it away, even if some of it was eaten and no one has gotten sick," wrote the CDC in the advisory.

(MORE: Check the Thanksgiving Travel Outlook)

The CDC added that the advisory includes all types of romaine lettuce, from precut to whole heads to spring mix. If you're unsure about whether or not the contents of your lettuce contains romaine, you're advised to throw it out anyway.

Furthermore, any refrigerator surfaces where romaine lettuce has been stored should be cleaned properly, per the CDC's guidelines.

The advisory comes months after the worst E. coli outbreak in a decade. The outbreak, which forced millions to throw out their romaine lettuce, was traced back to infected water canals in Arizona. Five people died during the outbreak, which lasted from January to April, and more than 200 were sickened.