On January 22, Clark County officials in Washington declared a public health emergency, leading up to Inslee's state of emergency declaration on Friday.
A single case has been reported in Oregon State, due to the outbreak.
"So we can expect to continue to see cases related to this outbreak for many weeks and probably many months". Only 77.4 percent of all public students there complete their vaccinations, according to state records cited by the Oregonian.
"It's not a very rapidly moving disease, it takes a week to three for someone to become sick", said Dr. Jeffrey Duchin, a public health officer for Seattle and King County, in an interview with King 5.
However, "People who believe they have symptoms of measles should not go directly to medical offices, urgent care centers or emergency departments (unless experiencing a medical emergency) without calling in advance", it warned.
The BC Centre for Disease Control, a part of the Provincial Health Services Authority, provides public health leadership through surveillance, detection, treatment, prevention and consultation services.
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The measles vaccine is available at local clinics and pharmacies as a combined measles, mumps and rubella (MMR) vaccine.
Measles symptoms begin with a high fever, cough, runny nose and red eyes, followed by a rash that usually begins at the head and spreads to the rest of the body. Years after the measles vaccine was introduced in the United States in 1963, officials considered the illness eradicated in the country. Thirty of the confirmed cases are in Clark County and one confirmed case is in King County. This was the second greatest number of annual cases since 2000.
In 2018, there were 17 outbreaks and about 350 cases of measles in the U.S.
The majority of the cases involve children younger than 10. State figures reveal that 7.9 percent had been exempted from the mandate that children entering kindergarten should have been vaccinated for the disease before being accepted.
Health department officials have connected 27 of the Clark County measles cases to non-immunized people while four cases remain unverified. On the East coast, travelers brought the infection back from Israel, which had experienced a large outbreak.
They added the outbreak could still be in its infancy as the incubation period of the virus averages 14 days. These locations include a Costco, an IKEA, the Portland airport, and the basketball arena where the Portland Trail Blazers play. Serious complications such pneumonia and brain infections can arise from the disease in some cases. Clark County has information about areas where measles exposures have happened on their website. Those people stayed home and later got ill, Armstrong said. "I can tell you, anybody who says that has never had measles".