Five people have tested negative while nine others are waiting for results.
Also Thursday, China's national health commission confirmed 25 people have now died from the respiratory virus. Authorities there are battling to contain it.
One case has also been confirmed in the U.S., while multiple people are being tested for the disease in the UK.
Chinese officials have not said how long the shutdowns of the cities will last.
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"Make no mistake, though, this is an emergency in China", he said.
Speaking at a news conference in Geneva on Thursday, the World Health Organization Director-General Tedros Adhanom Ghebreyesus said that while WHO's assessment is that the outbreak represents a "high risk" regionally and globally, it is "too early" to declare it an worldwide health concern.
Since then the number of confirmed cases has risen to 850 while 26 deaths have been reported.
He told MPs: "The chief medical officer has revised the risk to the United Kingdom population from "very low" to "low" and has concluded that while there is an increased likelihood that cases may arise in this country, we are well prepared and well equipped to deal with them".
A reporter for TVB said they were detained at Jinyintan Hospital, where most of the sick were being treated, on January 14 and told to hand over all of their footage and photographs so they could be destroyed.
According to CCTV, China's state television network, officials in Wuhan shut down public transportation starting Thursday, attempting to quarantine about 25 million people by preventing them from leaving the area or using buses, subways, or ferries.
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World Health Organization officials said it was too early to take that step because there is no evidence yet of sustained human transmission of the virus outside China.
Outside of China, Thailand has reported four cases, Singapore three, with Japan, Vietnam and South Korea each reporting two.
Authorities around the world have announced screening measures for passengers from China.
The week-long holiday to welcome the Year of the Rat began on Friday, raising fears the infection rate could accelerate as hundreds of millions of people travel to their homes and overseas in what is usually a festive time of year.
The UK is monitoring direct flights arriving from China as a precaution.
"They're looking for ongoing presence of the virus", Diaz told CNN on Thursday.
"And that is essential because you can not deal with a potential pandemic in one country alone".
Last week, users of Sina Weibo, which is a social media site similar to Twitter, accused the government of withholding information about the virus.
With hundreds millions of people travelling across the country this week for the Lunar New Year holiday, the government has halted all travel out of the city, municipal public transport has been suspended, and residents have been ordered not to leave home.
The previously unknown virus has caused alarm because of its similarity to SARS (Severe Acute Respiratory Syndrome), which killed hundreds across mainland China and Hong Kong in 2002-2003.
Most of the cases are in the central Chinese city of Wuhan, where the virus is believed to have originated late a year ago.
The patient was not reported to have any prior medical conditions.