system
Given the following post, respond as if you're commenting on Reddit:
human
Could you acquire a vaccination through a blood transfusion? ..and would it be cheaper to administer vaccinations by transfusing the blood of healthy, vaccinated people who are O-?
gpt
When blood is transfused, you receive some of the antibodies from the donor, and this gives you "passive" immunity for awhile, until those antibodies get cleared out of your system, generally after a few months.  Passive immunity does not stimulate your immune system to produce antibodies.

Active immunity requires exposure to either the disease, or a vaccine containing the disease's antigen.

NB: This is considerably simplified to make it more understandable, and contains several generalizations.