"convalescent plasma" is blood plasma from a person who has recovered from a disease and is thus rich in the antibody response they generated to recover from it

"convalescent plasma" is blood plasma from a person who has recovered from a disease and is thus rich in the antibody response they generated to recover from it. It's been used in Ebola outbreaks as a "hail mary" to cure people - it's also one of the more absurdly easy things to do - pretty much just take a blood sample, spin out the platelets and inject the plasma left behind (clinically you can be a lot more careful, but its one of the weirdest effective "primitive" treatments you can do).