The World Health Organization has declared the coronavirus a global health emergency in recognition that the disease risk no longer is confined to China. United Nations member countries may decide to close their borders, cancel flights, implement special screenings at airports, or take other steps in response to the notice. U.S. health officials earlier this week announced they would fast-track work on a coronavirus vaccine, with the goal to have an early-stage trial within three months. That timeline is considered optimistic.
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