Two people have already died. They will focus on direct or connecting flights from Wuhan for now.
Temperature tests started at Wuhan's Tianhe worldwide airport on Wednesday but two flight attendants who were working at domestic terminals told Reuters they had not received any extra training or warnings. All the affected individuals had recently visited Wuhan. They can measure your temperature there.
One passenger said no one's temperature was above normal.
No human-to-human transmission has been confirmed so far, but Wuhan's health commission has previously said the possibility "cannot be excluded".
Wuhan's health authority confirmed earlier on Sunday 17 more cases of the virus in the city, bringing the total number of known patients there to 62.
Following the outbreak of a deadly viral strain of pneumonia in the central Chinese city of Wuhan, the Center for Disease Control and Prevention (CDC) in Atlanta, Georgia, has dispatched workers to three American airports.
The new coronavirus strain has caused alarm because of its connection to Severe Acute Respiratory Syndrome, or SARS, which started in southern China in late 2002 and spread to more than two dozen countries killing almost 800 people. A lot of them appear to have left for home for the Chinese New Year holidays.
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A handful of cases have also been reported overseas in Thailand, Japan and Singapore, which has said it has five suspected infections among people who had travelled to Wuhan.
This suggests that what is being called 2019-nCoV is a novel virus that has spread from animals to humans.
It is still not clear how well the virus can be transmitted, but there are indications of some limited spread from person-to-person, CDC officials said. Scientists say that it is also possible that the virus could mutate to become more risky.
Those countries are among at least half a dozen in Asia, as well as New York's JFK, San Francisco and Los Angeles airports in the United States that have started screening incoming airline passengers from central China.
Chinese authorities have set up additional checks due to heightened fears the outbreak spreads as the country prepared to celebrate the Chinese Lunar New Year later this month.
The WHO's China office said the analysis was helpful and would help officials plan the response to the outbreak. Wuhan is a main hub in China's railway network.
"It still requires close monitoring for any possible mutations", the commission said.