In November 2017 Public Health Seattle King County (PHSKC) investigated an outbreak of norovirus occurring among persons who consumed raw oysters at Elliott's Oyster House Annual Oyster event held on November 11, 2017. Thirteen attendees from 5 separate parties became ill. Three persons submitted stool samples which were positive for norovirus. As part of the investigation PHSKC environmental health specialists visited the restaurant to determine the source(s) of the oysters and how they were prepared and served. The oyster tags were collected and sent to the Washington Department of Health for traceback and investigation of growing areas. No additional risk factors were identified at the restaurant.