More bad news on Covid.
Coronavirus has characteristics of AIDS, that allows it to evade body's immune system. No wonder that plasma therapy doesn't work. No surprising news here either, that similarity was mentioned during the first months of the spread. It's now pronounced in more details.
Good luck with a vaccine that actually works.
https://www.scmp.com/news/china/science/article/3086177/coronavirus-uses-same-strategy-hiv-dodge-immune-response-chinese