Scientists around the world are racing to understand the deadly coronavirus disease, Covid-19, which emerged in China in December. The number of confirmed cases is already 10 times higher than the 8,100 known to have been infected by Sars, a similar virus that caused a six-month epidemic in 2003.
Though Covid-19 seems to have passed its peak in China, it is spreading rapidly elsewhere. Public health experts fear the respiratory illness, which is believed to have started in a food market in Wuhan, may become the most serious pandemic of the 21st century so far.
How dangerous is the new coronavirus?
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