The Netherlands is testing with plasma from a recovered patient right now:
Source: https://nos.nl/artikel/2330036-nederlandse-coronapatient-hee...
NB: I am NOT a microbiologist and do not know how far this is related.
Source: https://nos.nl/artikel/2330036-nederlandse-coronapatient-hee...
NB: I am NOT a microbiologist and do not know how far this is related.
Plasma contains molecules that contribute to immunity. The donation transfers those molecules from the donor to the recipient. It doesn't directly confer any immunity to the recipient, it reduces the amount of virus circulating in their body, giving their own immune system more time to respond.
It seems very promising.