If someone whos immune to say, chicken pox, and they donate blood, is the recipient also immunized?
There are few good answers but they are missing the most important part – when you donate the blood it isn’t kept whole or even transfused whole. They spin it down to separate the cells & plasma. So a single donation will have packed red blood cells, platelets and plasma. There are other things that blood donations can be used for but that is beyond the scope of this venue. Usually ones immunity is carried by the different types of white blood cells and the white blood cells are not used in a transfusion. Therefore impossible for the recipient of a blood product to get any immunity against the chickenpox virus.