1st case of coronavirus confirmed in US

As the World Health Organization holds an emergency meeting on the coronavirus, a Washington state man has tested positive on his return from Wuhan, China, where the outbreak started.
4:16 | 01/22/20

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Transcript for 1st case of coronavirus confirmed in US
Now to growing concerns about the deadly coronavirus. Officially hitting the U.S. Here's what we know. A Washington state resident fell ill after returning from Wuhan, China, where the outbreak began. Officials now say more than 400 people have been sickened and 9 people have died. The world health organization is holding an emergency meeting right now. Kayna Whitworth is in Seattle, has the latest for us. Good morning, kayna. Reporter: Hey, robin. Good morning. That patient is a man in his he is in the hospital here behind me. Now, officials are describing his condition as satisfactory, but he will remain in isolation for at least the next couple of days. They will continue to monitor him as well as the health care providers and patients he came into contact with after testing positive for the coronavirus. The first case of the deadly coronavirus making its way to the U.S. According to the CDC the man in his 30s flew home to Seattle last Wednesday, infected but not yet symptomatic. According to officials shortly after arriving in Seattle he began feeling ill and reached out to his health care provider on Sunday. 24 hours later, his diagnosis was confirmed by the CDC. The man entering the country before federal health officials began screening travelers from the city of Wuhan. One of the busiest transportation hubs in central China and where the outbreak began. This is certainly not a moment for panic or high it is a moment for vigilance. Reporter: This as some 3 billion trips are expected to be made by Chinese citizens heading home to celebrate the lunar new year spring festival. A reported 7 million Chinese tourists expected to travel abroad. Chinese officials taking every precaution to contain the virus. Workers outside of the local hospital in biosuits. Officials screening travelers as they enter and leave the airport. Our Bob woodruff is here walking through Wuhan airport wearing a three-ply surge challenge mask to limit his exposure to the The city is now controlling people going in and out of the city then also local tourist groups are being banned from leaving. The government does not want this infection to leave. Reporter: Screenings now expanding to five U.S. Airports including Chicago and Atlanta and anyone hoping to enter the U.S. From Wuhan must do so through one of those locations. So right now the CDC is retracing this Washington man's steps. They say he actually did not visit that fish and meat market in Wuhan where they believe this virus originated and also, Michael, they're really crediting this man for quickly alerting doctors once he became symptomatic. All right, thank you so much, kayna. Now we bring in Dr. Jennifer Ashton to answer a few questions we may have, doc, there's so many questions about transmission of the virus. Human-to-human, yesterday we talked about that. What more do we know? Again, what we know is that it's spreading. That's not really a surprise. What we don't know is a lot about this virus. We don't know its incubation period. We don't really know the root of transmission. It is a coronavirus which normally spreads via respiratory droplets but don't know the specifics. We don't know how contagious it is meaning which amount of people exposed get sick or the severity of the illness. How many develop mild symptoms like pneumonia requiring hospitalizations and don't know the fatality rate yet. What's been done to protect the public? A lot of this has been prepped and primed by the response of not only the CDC but the world health organization in response to sars so we know how to act more quickly, more efficiently. Here in this country as we hear flights coming from Wuhan will only be allowed to land at certain airports where this screening can take place. Passengers will then be screened and if sick they will be isolated. If asymptomatic they'll be given very important educational materials as kayna said. Health care providers urged to screen and new testing methods gotten out by the CDC so we can identify the cases more quickly. All right, doc, thank you. You bet.

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

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