“Convalescent Plasma”?
Where ‘n He’ll ya get that?
Leisure World?
“Where ‘n He’ll ya get that? Leisure World?”
the same place they got the word “blood”for blood ... it’s a medical term: convalescent is the medical term that means someone who is recovering from an illness, thus convalescent plasma means the liquid portion of blood from someone recovering from an illness:
https://www.google.com/search?q=Convalescent+Plasma