The Oregon Health Authority is investigating E. coli cases linked to Chipotle restaurants in Oregon and Washington.
Three people in the Portland area and at least 19 people in Washington have been sickened since October 14. No deaths have been reported but about 1/3 of reported cases were hospitalized.
O.H.A. spokesman Jonathan Modie says people have reported symptoms in Clackamas and Washington counties in Oregon.
A spokesman for Chipotle says the company was notified that customers became sick after eating at six restaurants in the region. Chipotle immediately closed all its restaurants in the area "out of an abundance of caution."
Chipotle says it's working with health officials to find the cause of the outbreak.
