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The Wuhan virus is causing growing concern, here are some of the facts about coronaviruses.
The new virus which broke out in Wuhan, China, infected hundreds, and killed at least 25 people is a coronavirus. This family of viruses is the same as the one that caused the Severe Acute Respiratory Syndrome (Sars) outbreak in 2003, killing 774 worldwide, 299 of them in Hong Kong. It is also the same family as the Middle East Respiratory Syndrome, which, as its name suggests is circulating in the Middle East. Mers has killed 858 people so far.
The Wuhan virus is referred to as novel, that is 'new', coronavirus, and has been named 2019-nCoV.
Coronaviruses are named for their appearance. "Corona" is Latin for "crown". When viewed under a microscope, these viruses have bits sticking out from them that look a bit like a royal crown.
Coronaviruses are quite common in humans. They infect the upper respiratory tract, and most are not deadly. Almost everyone will be infected by one or other type of these viruses in their lives.
Some coronaviruses infect animals, and not humans. A few start off infecting only animals and then mutate to be able to infect humans. Wuhan virus: what you need to know
Only seven coronaviruses so far have done this. 2019-nCoV is believed to have come from bats and snakes. Sars came from civet cats, and Mers from camels. There are several known coronaviruses which are circulating in animals that have not yet infected humans.
Coronaviruses cause diarrhoea and respiratory tract infections in animals like cows and pigs. In people, they can mimic the common cold, but may also lead to pneumonia. The virus spreads among humans when they cough or sneeze.
There is no specific treatment or antiviral drug for coronaviruses. The best way to prevent catching one is by practising good hygiene.