Chinese authorities have advised people to stop travelling in and out of Wuhan, the city at the centre of a new virus outbreak that has killed nine.
The new virus has spread from Wuhan to several Chinese zones, as well as the US, Thailand and South Korea.
The virus, which is also known as 2019-nCoV, is understood to be a new strain of coronavirus that has not previously been identified in humans.
The Sars virus that killed nearly 800 people globally in the early 2000s was also a coronavirus.
Authorities have also admitted that the country was now at the most critical stage of prevention and control.
China has still not been able to confirm the exact source of the virus. Though the transmission route of the virus is yet to be fully understood, there is a possibility of virus mutation and a risk of further spread of the epidemic.
Those living in the city of 8.9 million people have been told to avoid crowds and minimize public gatherings.
China earlier this week confirmed that human-to-human transmission of the virus has taken place.
A patient who has transmitted the virus to more than 10 people has been discovered so far.
At least 15 medical workers in Wuhan, who presumably came into contact with patients, are known to be infected.