"Plasma therapy is not new. German physiologist Emil von Behring won the Nobel Prize in 1901 for using it to treat diphtheria. It was also used during the Spanish Flu in 1918." - Quoted from an Indian news link.
It was tried early on in Wuhan. As it was not a clear test for the use of plasma therapy, it did not draw attention. But many countries are experimenting as the process of getting the plasma appears easy. Unfortunately, there is no definitive proof it will work. However, desperation has lead people to go for it and demand.
It was today announced that it has emergency authorization in the USA.
Read more here:
June 3, 2020
https://www.webmd.com/lung/news/20200603/plasma-therapy-helps-critically-ill-covid-patients#1
July 13, 2020
https://www.bbc.com/news/world-asia-india-53387607
August 21, 2020
https://www.aarp.org/health/conditions-treatments/info-2020/fda-halts-plasma-use-for-covid.html
August 23, 2020
https://www.npr.org/sections/coronavirus-live-updates/2020/08/23/905277083/fda-authorizes-convalescent-plasma-as-emergency-treatment-for-covid-19
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