Officials in Multnomah County are reporting a fifth possible case of Measles.
Four people already diagnosed with measles were exposed to the highly contagious virus from an ongoing outbreak in Clark County, Washington.
Multnomah County health officials announced the fifth possible case on Sunday. They said a link between the case and the Clark County outbreak has not been identified.
Officials say people might have been exposed to the virus at the Portland International Airport and Randall Children's Hospital.
In Washington, health officials say 66 people have been affected by the viral illness. Most of the cases have involved young children under 10 years old who weren't immunized.
There's been two cases of people who got measles despite being immunized.
Health officials say at least 21 days need to pass before they feel comfortable saying the outbreak is over. Anyone who has been exposed to the disease and is showing symptoms is asked to call their health facility before visiting.