What is coronavirus?
According to the World Health Organization (WHO), coronaviruses are a family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS).
These viruses were originally transmitted between animals and people. SARS, for instance, was believed to have been transmitted from civet cats to humans while MERS travelled from a type of camel to humans.
Several known coronaviruses are circulating in animals that have not yet infected humans.
The name coronavirus comes from the Latin word corona, meaning crown or halo. Under an electron microscope, the image of the virus is reminiscent of a solar corona.
A novel coronavirus, identified by Chinese authorities on January 7 and named 2019-nCoV, is a new strain that had not been previously identified in humans.
Little is known about it, although human-to-human transmission has been confirmed.
What are the symptoms?
According to the WHO, signs of infection include fever, cough, shortness of breath and breathing difficulties.
In more severe cases, it can lead to pneumonia, severe acute respiratory syndrome, kidney failure and even death.
The incubation period of the coronavirus remains unknown. Some sources say it could be between 10 and 14 days.
How deadly is it?
Some experts say it may not be as deadly as other types of coronavirus but in China, at almost 6,000 cases, the infection is more widespread than in terms of case numbers.
Where have cases been reported?
Most cases have been reported in China.
All deaths have been in China – the vast majority in Hubei province.
Other countries with confirmed cases are Australia, Combodia, Canada, France, USA, Thailand, Taiwan, Germany, Japan, Malaysia, Singapore, South Korea, Nepal, Srilanka, Vietnamand the United Arab Emirates.
How can the virus spread be stopped?
There is no vaccine yet for the new virus.
Chinese authorities have effectively sealed off Wuhan, state media said.
More than a dozen other Chinese cities also adopted transport restrictions, affecting 56 million people.
Several airlines, including United Airlines and British Airways, have cancelled flights to China.
Airports around the world have introduced screening measures and some countries are working to evacuate their citizens from Wuhan.
Origin of the virus
Chinese health authorities are still trying to determine the origin of the virus, which they say came from a seafood market in Wuhan where wildlife was also traded illegally.
The WHO also says an animal source appears most likely to be the primary source of the outbreak.
Snakes, including the Chinese krait and the cobra may be the source of the newly discovered virus, according to Chinese scientists.
Is this a global emergency?
The outbreak does not yet constitute a global emergency, the WHO has said.
WHO chief Tedros Adhanom Ghebreyesus has said the decision to hold off on issuing the declaration used for the gravest epidemics should not be taken as a sign that the body does not think the situation is serious.
There have been five global health emergencies since 2005 when the declaration was formalised – swine flu in 2009; polio in 2014; Ebola in 2014; Zika in 2016 and Ebola again in 2019.