What is the coronavirus and how worried should we be about it?

What are the symptoms caused by the virus from Wuhan in China, how does it spread, and at what point should you contact a doctor?

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It is a member of the coronavirus family that has never been encountered before. Like other coronaviruses, it has come from animals. Many of those initially infected either worked or frequently shopped in the Huanan seafood wholesale market in the centre of the Chinese city, which also sold live and newly slaughtered animals.