In October 2011 investigators at Public Health Seattle King County investigated an outbreak of norovirus linked to consumption of a raw oyster dish at a local restaurant. Three of 7 meal companions had consumed raw oysters. All three reported onset of illness within 24-48 hours. The four diners who had not eaten the raw oysters did not become ill. Laboratory testing of stool collected from one ill person tested positive for norovirus, sequence analysis identified GI.1 and GII.17 strains.Product traceback revealed that the oysters were imported frozen from ASSI a South Korea company. Oysters were collected from the restaurant and tested at FDA. Results were positive for norovirus. Sequence analysis of the oysters identified a GII.3 strain. A recall was issued on November 4, 2011.