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A sign prohibiting all children under 12 and unvaccinated adults stands at the entrance to PeaceHealth Southwest Medical Center in Vancouver, Washington following a measles outbreak that has sickened more than 40 people in the Pacific Northwest. The outbreak has prompted a call to eliminate a "philosophical" vaccine exemption that's resulted in 4 percent of children in Washington state to attend school without their routine childhood shots. (AP Photo/Gillian Flaccus, File)

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Northwest measles outbreak revives debate over vaccine laws

Washington Gov. Jay Inslee last week declared a state of emergency because of a recent measles outbreak.