The Foreign Office has issued new travel advice over the coronavirus outbreak in China.
In updated guidance, it warns against all travel to Hubei province – where the virus began – and urged Britons already there to leave if they can.
The province has been on lockdown for days as the authorities try to contain the virus, which has so far killed at least 56 people.
But some British people in Hubei province say they cannot leave.
The virus originated in the city of Wuhan in Hubei province, and has infected almost 2,000 people since its discovery.
In the UK, tests on 31 people suspected of contracting the virus have come back negative, the government said on Saturday.
In its most recent update, the Department of Health said there are currently "no confirmed cases in the UK or of UK citizens abroad, and the risk to the public is low".
Officials are trying to trace around 2,000 people who have flown to the UK from Wuhan in the past fortnight.
Chinese President Xi Jinping has warned the spread of the virus is accelerating, telling senior officials the country is facing a "grave situation".
Checkpoints in Hubei province are preventing people from leaving, the airport has been closed, and many of the roads are blocked to all vehicles except those carrying patients or medical supplies.
In addition, private vehicles have been completely banned from central districts of Wuhan.
British scientists said that it may not be possible for China to contain the virus.
Researchers at the MRC Centre for Global Infectious Diseases have calculated that each person is passing the virus on to two or three others.
The scientists, based at Imperial College, London, say the transmission rate needs to be cut by 60% in order to get on top of the outbreak.
Some British citizens stranded in Wuhan have criticised the government's response.
Yvonne Griffiths, a university lecturer from Cardiff, is due to fly home on Monday, but is not confident that will happen: "I am disappointed at the absolute silence on the issue of how stranded people are going to get home.
"And it seems maybe the British government at the moment has either a lack of concern or a lack of planning in place, I'm not sure."
One British man who had travelled to Wuhan to visit his girlfriend is stranded there after his return flight on 3 February was cancelled.
The 29-year-old, who did not want to be named, told the PA news agency trying to get out of the city is "impossible".
He said: "There have been sporadic warnings from local government in Chinese to tell us that there will be rRead More – Source