The coronavirus has brought cities to a standstill, spread to nearly 30 countries and claimed hundreds of lives. 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. If everyone infects 1.5 people, a single person could give

Source: The Times February 01, 2020 12:00 UTC