The World Health Organization says people who choose not to vaccinate has emerged as a global health threat for 2019. USA TODAY

Health officials near Portland, Oregon, have declared a public health emergency over a measles outbreak that’s affecting mostly young children.

Clark County, Washington, has identified 23 cases and seven suspected cases; 18 of those are among children younger than 10 years old, officials said Wednesday. None of the people infected were vaccinated, Public Health Director Alan Melnick told CBS News.

The county has one of the lowest vaccination rates in the state, with more than 22 percent of public school students having not completed their vaccinations, The Oregonian reports, citing state records.

Measles is so contagious that 90 percent of unvaccinated people who come in contact with an infected person will get the virus, according to the Centers for Disease Control and Prevention. The virus can also spread four days before and after symptoms appear.

Officials near anti-vaccination "hot spot" Portland, Oregon, are declaring a public health emergency over a measles outbreak.

Officials identified airports including the Portland International Airport, health care facilities, schools and churches as possible locations where people might have been exposed to this outbreak.

The measles two-dose vaccine is 97 percent effective against the virus, according to the CDC.

People infected develop a red spotted rash that starts inside the mouth an spreads all over the body. Symptoms also include fevers as high as 104 degrees, cough, runny nose and red, watery eyes.

People choosing not to vaccinate has emerged into a global health threat in 2019, the the World Health Organization recently reported. The CDC has also recognized that the number of children who aren’t being vaccinated by 24 months old has been gradually increasing.

Some parents opt not to vaccinate because of the discredited belief vaccines are linked to autism. The CDC says that there is no link and that there are no ingredients in vaccines that could cause autism.

More: These 15 U.S. cities are hotspots for kids not getting vaccines

Contributing: Brett Molina and Joel Shannon, USA TODAY. Follow Ashley May on Twitter: @AshleyMayTweets

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Measles outbreak in anti-vaccination hot spot declared an emergency by Washington health officials