A sign at a clinic in Vancouver, Washington on Jan. 25, 2019 asks unvaccinated children 12 and younger to leave the facility. Gillian Flaccus/AP Photos

Measles: Why it’s so deadly, and why vaccination is so vital

A measles outbreak is causing major concern in a Washington county where only 22 percent of children are vaccinated against the disease. A vaccine expert explains the risks.

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