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the coexistence of two types of strains, which they call ‘L’ (more
virulent) and ‘S’ (less virulent), the ‘L’ being more prevalent but
the ‘S’ becoming seemingly progressively more frequent because human
- actions put more pressure against the more virulent strains.
+ actions put more pressure against the more virulent strains. ⚔
+ [Beware](https://twitter.com/SciTania/status/1235283259510214656)
+ that the difference in virulence is inferred from propagation rates
+ rather than observed on clinical data, and the selective pressure
+ explanation is debatable.
* [Report on monitoring of persons exposed to patients with
Covid-19](https://www.cdc.gov/mmwr/volumes/69/wr/mm6909e1.htm)