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of the effects of the 1918 flu pandemic; key message: closing early
is important.
+* [A paper on the origin and continuing evolution of
+ SARS-CoV-2](https://academic.oup.com/nsr/advance-article/doi/10.1093/nsr/nwaa036/5775463)
+ published on 2020-03-03 in the National Science Review, discussing
+ 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.
+
* [Report on monitoring of persons exposed to patients with
Covid-19](https://www.cdc.gov/mmwr/volumes/69/wr/mm6909e1.htm)
published 2020-03-03 in CDC's Morbidity and Mortality Weekly Report: