Hundreds of Americans who returned to the United States Wednesday from the epicenter of the Wuhan coronavirus outbreak are voluntarily quarantined at the March Air Reserve Base in southern California.

Evacuees aren’t required to stay in base housing, but US Centers for Disease Control and Prevention officials said passengers were asked to stay for three days of testing and monitoring, and they are willing. If a passenger demanded to leave before the three-day period had passed, it would be a discussion “up to the highest levels within the US government,” officials said during a press conference on Wednesday.

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