Washington Governor Jay Insel announced a state of emergency on Friday for 31 cases of measles in the state.
The declaration allows the state to request medical supplies from other countries and tells state agencies to do their best to help workers who treat people with measles and try to stop the spread of the highly contagious disease.
"Morbili is a highly contagious infectious disease that can be fatal to young children," says Inslee. "The existence of 26 confirmed cases in Washington State creates an extreme risk to public health that can spread rapidly to other countries."
Clark municipality announced on Friday that there are 30 confirmed cases of measles in the Vancouver region. A person in King County has also been diagnosed.
The outbreak of Vancouver measles to 30 people
There are nine other suspected cases in Clark County. Most of the infected are children 10 years of age or younger.
The emergency declaration shows the weight of the unusually large hearth. Washington has not seen the outbreak of such a magnitude in recent memories, and public health officials expect the number of those affected to rise in the coming months.
The morbilli is highly contagious and can remain in the air after an infected person has left the area within two hours. The State Emergency Statement says that anyone who has not been vaccinated and comes into contact with an infected person will probably get the disease.
Washington and Oregon do not have enough people who have received vaccines to achieve what scientists call "herd immunity" that can stop the progression of the disease before it starts.
The measles vaccine is 97% effective and the Washington Health Department is trying to provide it for little or no cost to people who can not afford it.
Burst of measles from the Vancouver area: Where you may have been exposed
– Molly Harberger