The coronavirus has brought cities to a standstill, spread to nearly 30 countries and claimed hundreds of lives.
As of today, more than 14,000 people had caught the virus, which is thought to have been passed to humans at a seafood market in the Chinese city of Wuhan.
The number of cases has already beaten the number of infections caused by the 2003 Sars outbreak, in a fraction of the time.
When understanding how quickly viruses spread, experts measure how many people each person with the virus could infect if no precautions were taken. For coronavirus, the best estimates range from 1.5 to 3.
This number makes a huge difference to the rate of infection. If everyone infects 1.5 people, a single person could give
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