Plasma is the yellow liquid part of your blood.................
Gamma globulin is the term of a family of blood fractions, some of which include immunoglobulins. These are present in the blood serum of the patient who has developed antibodies, and can greatly mitigate the effects of the disease. This procedure was used as a last-ditch stand against the effects of an active case of polio, in the days before a vaccine was available. It has always been scarce supply.
that is the way medical care was performed prior to antibiotics.