>> “Exposure to some things seems to help the immune system.” <<
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Absolutely true; exposure through skin contact or intestinal contact, but not by injection directly to the blood.
One shot that I always accept, is Tetanus.
This is one of many issues that doctors themselves who aren’t fond of vaccines bring up. Bypassing several layers of the immune system is not natural. It requires the body to go into emergency mode as the foreign invader has gotten into the core of the body intact and without any warning or any external defenses, like the skin, trying to deal with it first. So your inflammation response to attack has to be extreme.
ANd then we wonder why auto-immune diseases are so much more common these days, especially among younger people.