Regardless of what you think of vaccination and whether or not you choose it for yourself and your family, most of us believe it is a very modern thing, dating to some time after germ theory and the dawn of pasteurisation.
Here is an article that seems to demonstrate otherwise, that vaccination and stimulating the immune system generally seems to have more ancient antecedents.
Never underestimate the past. Our ancestors weren't stupid.
Journeys Through Inner Space
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