A point for Will:
Everyone in the millitary is required to get a flu shot, so yeah, given your theory (weapons aside) our millitary would be really weak at this time of year due to the "poision" in the shot. But they aren't... so hum.
And to follow up Zeph, LOTS of things can be poisionious espically in large doses. Hell, a person can kill themselves by drinking too much water does that mean we shouldn't drink it? No.
Many times vaccinations will have smaller side effects or reactions. I've been vaccinating my horses for years for an illness called Strangles (which infects the lymphnodes and causes them to burst, most times it is not fatal because the main nodes infected are directly between the cheeks or above the eyes) which is not as common of a vaccine as say West Nile at this point. However, dealing with a few days of lethargy after the vaccine is much better than struggling for months with softball sized lymphnodes which finally burst and have to be cleaned, while the horse is kept sedated from the pain. Mind you, the vaccine cannot fully prevent Strangles but if it does not prevent it it lessens the degree of the illness. I have seen this work because my then 23 year old horse (at that age, given that he has cancer and other various problems it is concidered that he has a "weakened" immune system... though you couldn't prove it by his attitude) was stabled next to a horse who broke out with a severe case of Strangles and was weeping puss into his stall. He didn't get sick, so to me the small side effects and the little bit of "poision" I put in him is worth the risk, instead of having him in pain for weeks.
Vaccines have good points and a few falling points. To each their own. Just keep in mind that many times a vaccine cannot prevent the illness 100% but can keep the degree of the illness down. Who wouldn't want that when they're puking their guts out for days on end?
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Horses come and go, but some leave permanent hoof prints on your life.
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