What is coronavirus, what are its symptoms and how worried should we be?

What symptoms are related to the Covid-19 virus from Wuhan in China, how is it spread and when should you call 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.