Sean Rossman is reporting for USA Today the federal E. coli warning has been expanded to all types of romaine lettuce harvested in the Yuma, Arizona region as a nationwide outbreak affecting dozens of people is investigated. The U.S. Centers for Disease Control and Prevention said people in Alaska reported getting sick after eating whole heads of romaine lettuce from Yuma. Previously the warning only referred to chopped romaine. It's now expanded to all types, including hearts of romaine, salads and salad mixes. The CDC advised that all romaine lettuce originating from the Yuma region should be tossed. All romaine from Yuma should be tossed, even if it has already been eaten and no one has gotten sick.  "Produce labels often do not identify growing regions," the CDC said April 20. "So, throw out any romaine lettuce if you're uncertain about where it was grown." Read the full story in USA Today.