One of the best articles I've read about the dynamics of the spread of Covid-19. It has significant implications for public health policy and helps to explain why some countries with less restrictive policies (Japan, South Korea, Taiwan) have had excellent results controlling the spread. Warning: there are several comparisons to influenza.

- 80% of spread comes from 20% of infected people (i.e. super spreaders).
- 80% of infected people infect zero or only 1 other person.
- tracking and tracing the people who were in contact with every person who has tested positive, and asking them all to test/isolate/quarantine is highly ineffective and a waste of resources.
- tracking and tracing should be done in the opposite direction. Look at the contacts of the infected person prior to their testing positive to identify the super spreaders.