Ummm, y'know you can catch it more than once per season.
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Only time that ever happens for me is when I get one of those fucking shots.
When I avoid the shots, I usually either don't get it or get it once for maybe three days.
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I stay away from the shots, too. I rarely get the flu anyway, and when I do get sick in the winter it's usually something to do with my sinus'..