1. Why are we so concerned about this virus, which so far (as of mid-March) has killed many fewer people than an ordinary flu?

The key to the answer lies in the words “so far.” The virus seems to spread at a phenomenal rate, with cases doubling more than once a week. If the number of deaths were to double once a week, then starting from about 200 deaths on March 15, by the end of May the total would be 200,000 deaths, which is about ten times the number that we get from ordinary flu.

The Imperial College paper made an extrapolation that warned of the possibility hundreds of thousands of deaths if social distancing were not encouraged.

2. How do differences in testing

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