there's plenty of resources regarding the anti-viral properties of mushrooms in general.

https://www.youtube.com/watch?v=7agK0nkiZpA&t=9s
http://mushroomreferences.com/
Chloroquine has been identified as a possible remedy.
https://www.ncbi.nlm.nih.gov/pubmed/32074550
Which is an anaolgue of Quinine, an extract of the Cinchona plant.
https://en.wikipedia.org/wiki/Cinchona
used to reduce viruses in bees
https://www.youtube.com/watch?v=1Q0un2GPsSQ&t=1896s

so why is no one considering this against COVID-19?