It is not clear where the man got infected but he reported he had recently traveled to Vancouver, Washington where there is a large, ongoing measles outbreak.
Anyone who has been exposed and believes they have symptoms of measles to call their health care provider prior to visiting the medical office.
Anti-vaccine activities appear to be more of a western phenomenon, especially in the Pacific Northwest and the American Southwest.
Before he was diagnosed, he may have exposed others to the measles at Sea-Tac Airport and the Emergency Department of Harborview Medical Center.
Four new confirmed cases within the same household.