Are U.S. E. Coli Cases Tied to Romaine Lettuce?

U.S. officials are investigating whether the outbreak, which has killed two people, is tied to a similar case in Canada.

From: https://www.webmd.com/food-recipes/food-poisoning/news/20180103/are-us-e-coli-cases-tied-to-romaine-lettuce?src=RSS_PUBLIC