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## Topical or time-specific links: ##
+* [A thread about immunity by Nicholas
+ A. Christakis](https://threadreaderapp.com/thread/1240689935557865472.html)
+ (2020-03-20) explaining what we now know and don't know.
+
* [A thread about
favipiravir](https://threadreaderapp.com/thread/1240261123712126978.html)
(2020-03-18) as a possible treatment of Covid-19.