Vancouver, W.A. (KOMO) - State health officials say the first person to contract measles in the latest outbreak was someone from outside the country.
That person, according to State Epidemiologist Dr. Scott Lindquist, came into contact with a large group of un-vaccinated children.
"All those kids that were un-immunized went to public places like Ikea, Costco and a Portland Trailblazers game," he said.
Measles is highly contagious and the pathogen can linger in a room for hours after an infected person has left.
There are now 50 confirmed cases in Washington State — 49 in Clark County and one in King County. More than 100 others are actively being monitored.