More than 200 Americans returning to US amid outbreak

The number of cases of coronavirus jumped 60% overnight in China, and Americans landing in California will be quarantined for at least three days.
2:00 | 01/29/20

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Transcript for More than 200 Americans returning to US amid outbreak
Next, at this hour, a group of Americans in China, the epicenter of that outbreak, have gotten onto a plane. They are on their way home tonight. And here in the U.S., passengers are now being screened at 20 airports. And authorities in Lawrence, Kansas, a short time ago, revealing that they are now investigating a possible new case. ABC's will Carr is in Ontario, California, where those Americans will land and what will happen to them next? Reporter: Tonight, as the coronavirus spreads rapidly in China, more than 200 Americans are heading back to the united States. Cases jumped 60% overnight in China, where the death toll now stands at more than 100. In this picture inside a cockpit, you can see the extend of the protective measures being taken. Very relieved to be going home. Reporter: Patrick Stockstill's bag is packed. We're here at the airport. It is completely empty. We've got our tickets. We're just waiting for the next step in the process. Reporter: The stockstills, along with American officials and their families, were tested before boarding that charter flight. They'll refuel in Alaska and fly onto Ontario, California, about 45 minutes east of Los Angeles. They'll be screened, evaluated constantly, there will be physicians on the flight. Reporter: Is Ontario ready? Yes, it is. We go through training and exercises all the time. Reporter: The CDC plans to quarintine the Americans for three days in California, testing them for any signs of illness. So far, five Americans have contracted the coronavirus. Authorities are now screening passengers for the new virus at 20 domestic airports, and health officials are warning Americans to avoid any travel to China that's not absolutely essential. And will Carr with us tonight. And will, I know the passengers are going to be held for three days, as you reported, but what happened if a passenger then shows symptoms? Reporter: That's right, David. Nobody on that charter flight is going home right away. If anybody shows any symptoms, they could be quarantined here up to two weeks. Tonight, authorities say they're not taking any chances. Will Carr tonight. Thank you, will. And next, to the impeachment

This transcript has been automatically generated and may not be 100% accurate.

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