Measles symptoms include fever, rash, cough and red, watery eyes, according to Public Health - Seattle & King County. Under Inslee's declaration, state agencies can use all available resources to help affected areas and additional medical resources can be requested from other states.
The World Health Organization in November warned that measles cases worldwide had jumped more than 30 percent in 2017 compared to the previous year, in part because of children not being vaccinated.
Officials say the man had recently traveled to Vancouver, Washington, where a measles outbreak is happening, but it's not clear if that's where he was infected.
Clark County is an area American Health authorities call an "anti-vaccination hot spot".
Additionally, Washington's Emergency Operations Center is coordinating resources to support the state Department of Health and local officials to reduce impacts of the outbreak, and assess for any possible long-term effects.
But there has been a recent rise in unvaccinated children.
Washington Gov. Jay Inslee declared a state of emergency over the measles outbreak Friday.
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Cases have now been confirmed in OR as well. Public health officials are focused for now on preventing more exposures.
Officials there say they expect more cases.
In 2018, there were 17 outbreaks and about 350 cases of measles in the U.S. "Two doses of measles, mumps and rubella (MMR) vaccine provides over 95 percent protection against measles and that protection is long lasting".
Before the vaccine, 400 to 500 people died from the measles each year, 50,000 people were hospitalized and 4,000 people developed brain swelling that can cause deafness, he said. The measles vaccine consists of two shots, one given by age 2 and the second usually between ages 4 and 6.
"Measles is a highly contagious infectious disease that can be fatal in small children", Inslee said in his proclamation Friday, adding that these cases create "an extreme public health risk that may quickly spread to other counties".
Officials have identified several locations in Auburn, Kent and Covington, including two crowded high school basketball games at Kentlake High School on January 10 and 12, visited by the infected person last week.