The World Health Organization (WHO) has declared a global health emergency over a new coronavirus that has killed more than 2,900 people worldwide following an outbreak in the central Chinese city of Wuhan.
More than 85,000 cases of infection have been reported globally, most of them in mainland China.
What is coronavirus?
According to the WHO, coronaviruses are a family of viruses that cause illnesses ranging from the common cold to more severe diseases such as severe acute respiratory syndrome (SARS) and the Middle East respiratory syndrome (MERS).
These viruses were originally transmitted between animals and people. SARS, for instance, was transmitted from civet cats to humans while MERS moved to humans from a type of camel.
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 looks like a solar corona.
The novel coronavirus, identified by Chinese authorities on January 7 and since named COVID-19, 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.
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Where did the virus originate?
Chinese health authorities are still trying to determine the origin of the virus, which they say likely came from a seafood market in Wuhan where wildlife was also traded illegally.
On February 7, Chinese researchers said the virus could have spread from an infected animal species to humans through illegally-trafficked pangolins, which are prized in Asia for food and medicine.
Scientists have pointed to either bats or snakes as the source of the virus.
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, multiple organ failure and even death.
Current estimates of the incubation period – the amount of time between infection and the onset of symptoms – range from one to 14 days. Most infected people show symptoms within five to six days.
However, infected patients can also be asymptomatic, meaning they do not display any symptoms despite having the virus in their systems.
Read more on what the coronavirus does to your body if you catch it here.
How deadly is it?
With more than 2,900 recorded deaths, the number of fatalities from this new coronavirus has surpassed the toll of the 2002-2003 SARS outbreak, which also originated in China.
SARS killed about nine percent of those it infected – nearly 800 people worldwide and more than 300 in China alone. MERS, which did not spread as widely, was more deadly, killing one-third of those it infected.
While the new coronavirus is more widespread in China than SARS in terms of case numbers, the mortality rate remains considerably lower at approximately two percent, according to the WHO.