WASHINGTON—The U.S. is screening passengers at 20 airports to monitor for the coronavirus, while federal health officials said the risk of extensive infections in the U.S. is low.

Robert Redfield, director of the U.S. Centers for Disease Control and Prevention, said authorities in the U.S. are monitoring passengers at 20 airports to see if any people arriving from overseas may have the virus, which originated in China.

So…

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