passive immunity is short term
it could either be from a mom giving the antibodies from her blood to the baby in her womb, and when the baby gets out, it still has some of the anitbodies to protect it (for a couple days/ months/ years)
or
antibodies are injected into a person (this is not a vaccine) to help cure the illness (rabies is an example of a disease where people inject the antibodies)
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