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Spin Zone / Re: Liberalism is the new slavery
« on: March 12, 2016, 06:39:52 AM »How does an infant know if they are allergic to something they've never been exposed to?First, not all drug reactions are "allergic" reactions. There are other types of reactions.
But as to allergic reactions, generally, if you have never been exposed to something, you won't be "allergic" to it. You become allergic to substances after you have been exposed. Sometimes that is years later after many many exposures, and sometimes it is after a single exposure. A good example is fire ants. Many people become allergic to fire ants after the first sting, and the second sting can kill them.
When you are exposed to a foreign, or toxic substance, your immune system will fight it off. That reaction may be unpleasant, and at that point, you immune system is now aware and on the lookout for that toxic invader. That is when you become allergic.