Could a blood transfusion from immune survivors of a deadly, bioengineered virus grant the same immunity to those who don't have it?

First question so hope I'm doing this right! Working on a setting right now where a bio-engineered virus/plague is wiping out a large portion of humanity. Most died upon first exposure. Some survived, but are dying slowly, while a third group has developed complete immunity.

How could this immunity be passed on to the dying survivors? Would a blood transfusion do it, assuming that it was indeed something in the blood that made these people immune to begin with? Or would it be something more complex, like maybe their ability to develop some kind of antibody where others couldn't? (in which case the dying survivors would have to derive such antibodies from the immune survivors)

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Could a blood transfusion from immune survivors of a deadly, bioengineered virus grant the same immunity to those who don't have it?

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