More than 40 Chipotle Mexican Grill restaurants in two Northwestern states remain closed as government officials continue to investigate an outbreak of food poisoning liked to the popular chain.
The 43 restaurants in Seattle and Portland, Ore., were temporarily closed this weekend after more than 20 people became sick after eating at the restaurants over the past two weeks.
One-third of those affected have been hospitalized and there have been no deaths, Oregon Health officials said on their website.
The illness is believed to be caused by E. coli, with symptoms including vomiting and bloody diarrhea.
The outbreak spotlights the growing risk posed by E.coli, which resulted in more food poisoning outbreaks during 2003-2012 than during the previous two decades, according to a Centers for Disease Control and Prevention report this past August.