There is a method a bit like this which I think is older than vaccines - docs can use some blood from someone who has had the virus and recovered therefore has the antibodies
Nowadays they clean it up and just use the platelets but it is still the same sort of thing* so you're not wrong
*My medical knowledge is limited at best so the details may be wrong but I believe that they use platelets because whole blood can get rejected for being the wrong type eg ABnegative etc The original idea was to hook up a cured person to a crook person and hope for the best
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