Answer Posted / kwarber
Any immunity developed by a living human is natural, by
definition. I think the question pertains to a distinction
between ARTIFICIALLY ACQUIRED v. NATURALLY ACQUIRED
immunity. Any time the target of a desired immunity
(antigen) is introduced by willful manipulation (injection
of antigen = vaccination, immunization), any introduction
into the body of something that would evoke an immune
response would be ARTIFICIALLY ACQUIRED, but the actual
production of antibody would be the body's natural response
to the injected material. When one becomes immune to
something as a result of a happenstance exposure, then that
would be NATURALLY ACQUIRED immunity. Like getting measles
from a friend who has active measles - the measles virus is
spread to you "naturally" as viruses in nature do, you get
measles as a result, and you are thereafter immune to any
future infection by the measles virus, thanks to your
body's natural immune response to the foreign invader, the
virus you picked up naturally.
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