The investigation into an outbreak of E. coli O26 illnesses linked to Chipotle restaurants in Washington and Oregon is up to 29 reported Washington cases. The latest update includes a case in an additional county, Whatcom.

The Washington State Department of Health continues working closely with local, state, and federal partners on a disease investigation to learn the extent of the outbreak and possible sources of E. coli bacteria.

In Washington, residents of Clark (12), Cowlitz (3), Island (2), King (6), Skagit (5), and Whatcom (1) counties have been reported as outbreak cases. Nearly all of the 29 cases reported having been at Chipotle restaurants before getting sick. Eleven of the Washington residents were hospitalized. Cases range in age from 1-to-67.

There are five Washington restaurants associated with this outbreak: Hazel Dell, 7715 NE 5th Avenue, Suite 109, in Vancouver; 1404 Broadway Avenue and 4229 University Way NE in Seattle; 512 Ramsey Way 101 in Kent; and 1753 S. Burlington Blvd. in Burlington.

The Oregon Health Authority is reporting a total of 10 cases of Shiga toxin E. coli O26 linked to eating at Chipotle restaurants in the Portland Metro area, up from three cases that were first reported October 31.

Among the cases, three were hospitalized. People in Multnomah, Clackamas and Washington counties, as well as Columbia, Benton and Deschutes counties have reported symptoms.

Five locations in Oregon are involved, all of them in the Portland metro area: Cascade Station at 9687 N.E. Cascades Parkway; Washington Square at 9120 S.W. Hall Blvd.; Lake Oswego at 8 Centerpointe Dr.; Tanasbourne at 2048 N.W. Stucki Ave., and Sunnyside in the Clackamas Town Center.