Blood transfusion for COVID??

Seen on twitter - video of Irish patient in hospital for 15 days.

@ 0.44 he says he was nearly in ICU, and that he got a blood transfusion. May be nothing but seems odd to this Medfag to transfuse for a viral infection?

https://twitter.com/rtenews/status/1243615900433031174?s=21

That hospital ship vid also made a thing about having a blood bank on board.