Thanks to vaccines, you no longer have to worry about polio or small pox. Thanks to vaccines, if you get bit by a rabid animal, you'll live and not contract it. Your immune system isn't going to protect you against everything and it's foolish to think it will.
As I stated above, it's very possible to not be sick and still be contagious to other people.
The flu shot does plenty, just because you're one of a minority that gets sick (chances are you already had it when you were vaccinated, depending on when you were vaccinated), doesn't mean it's utterly useless.










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