The governments of the U.S. and Canada are warning that all romaine lettuce recently purchased or currently for sale is unsafe to eat in any form. The U.S. Centers for Disease Control warns the lettuce is at risk of containing a dangerous type of E. coli bacteria and should be thrown away. Last spring, an E. coli outbreak linked to romaine killed five people and sickened more than 200 others. That outbreak followed a decision by the Trump administration to shelve water-testing rules crafted under President Obama that could have prevented the outbreak.