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A virus causing severe lung disease that started in China has spread to more than 50 countries.
The coronavirus had infected 78,927 people in China as of 28 February, with 2,790 of them dying.
What are the symptoms? t seems to start with a fever, followed by a dry cough.
After a week, it leads to shortness of breath and some patients require hospital treatment.
The incubation period - between infection and showing any symptoms - lasts up to 14 days, according to the World Health Organization (WHO).
But some researchers say it may be as long as 24 days.
And Chinese scientists say some people may be infectious even before their symptoms appear.
How deadly is the coronavirus?
Based on data from 44,000 patients with this coronavirus, the WHO says:
81% develop mild symptoms
14% develop severe symptoms
5% become critically ill
The proportion dying from the disease, which has been named Covid-19, appears low (between 1% and 2%) - but the figures are unreliable.
Thousands are still being treated but may go on to die - so the death rate could be higher. But it is also unclear how many mild cases remain unreported - so the death rate could also be lower.
To put this into context, about one billion people catch influenza every year, with between 290,000 and 650,000 deaths. The severity of flu changes every year.
How is the UK planning for an outbreak? Can coronavirus be treated or cured? Right now, treatment relies on the basics - keeping the patient's body going, including breathing support, until their immune system can fight off the virus.
However, the work to develop a vaccine is under way and it is hoped there will be human trials before the end of the year.
Hospitals are also testing anti-viral drugs to see if they have an impact.
How can I protect myself?
How did it start?
his virus is not really "new" - it is just new to humans, having jumped from one species to another.
Many of the early cases were linked to the South China Seafood Wholesale Market, in Wuhan.
In China, a lot of people come into close contact with animals harbouring viruses - and the country's dense urban population means the disease can be easily spread.
Severe acute respiratory syndrome (Sars), which is also caused by a coronavirus, started off in bats and then infected the civet cat, which in turn passed it on to humans.
The Sars outbreak, which started in China in 2002, killed 774 of the 8,098 people infected.
The current virus - one of seven types of coronavirus - does not seem to be mutating so far. But while it appears stable, this is something scientists will be watching closely.
Source : BBC