Reports have shown outbreak of a coronavirus has spread from Wuhan, China, to other major cities and abroad. On Wednesday, the World Health Organization (WHO) will consider declaring an international public health emergency over the coronavirus, as it did with swine flu and Ebola.
Now, the United Kingdom has begun monitoring flights arriving from China as part of a series of precautionary measures.
The measures, to be announced by the health secretary later, will apply to flights from Wuhan to London Heathrow.
Public Health England has upgraded the risk to the UK population from very low to low, the transport secretary said.
Chinese authorities have advised people to stop travel into and out of Wuhan, the city at the heart of the outbreak.
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They also admitted the country is now at the “most critical stage” of prevention and control.
So far, there have been 440 confirmed cases and nine people have died.
Most cases have been in Wuhan, but the virus has also spread to other Chinese cities.
A handful of cases have also been identified abroad, including in Japan and the United States, with no cases reported in the UK as yet.
A case previously suspected in Australia has been cleared, while the country remains on alert.
Experts do not yet know how or when the virus became infectious to people, but they believe the first cases were transmitted by an animal.
The virus causes severe lung disease in the infected.
Coronaviruses can cause symptoms ranging from a mild cold all the way through to death.
This new virus appears to be somewhere in the middle, according to experts, and pneumonia is being reported as a common illness associated with the virus.
Severe acute respiratory syndrome (Sars), which is caused by a coronavirus, killed 774 of the 8,098 people infected in an outbreak that started in China in 2002.
Dr Josie Golding, from the Wellcome Trust, said: “There is a strong memory of Sars, that’s where a lot of fear comes from.
“But we’re a lot more prepared to deal with those types of diseases.”
At the moment, there is no vaccine that can protect people against it, but researchers are looking to develop one.