The virus's ability to spread "seems to be getting stronger", China's health minister said.
Lunar New Year celebrations have been cancelled across the country as the virus continues to spread.
The first confirmed cases of the deadly virus were reported in Europe on Friday.
Checks are ongoing on other people.
Train stations have been closed, flights suspended and checkpoints put in place in Wuhan to try and stop the spread of the virus.
Suspected cases are being tested for in the UK. We explain the symptoms, where the virus has spread and what the experts say.
Fourteen people in the UK have been tested, with five confirmed negative and nine still awaiting the results.
The last plane to arrive directly from Wuhan to the UK landed just after 6pm on Wednesday – and all others have been suspended.
The number of cases of deadly outbreak is on the increase.
Public have been asked to avoid "all but essential travel” to Wuhan.