"'Natural' is normally taken to mean 'without human intervention'; so, vaccination is not natural - unless you are telling me that nurse Kerrie is divine and not human ;-)"
What I meant is that it is the human immune system that prevents the disease and in that seems it is completely natural unlike say a drug that kills a particular pathogen.
Polio is now very close to being eliminated according to the WHO. Obviously once eliminated or brought down to a very low incidence a a vaccination program can be stopped as in smallpox.
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