I'm not sure if I've ever had the flu before as I can't really tell the difference between that and a cold. I rarely get colds as is, and I don't think I've ever had it so bad that I fit all the flu symptoms, so I would guess I haven't had it before.
With that being said, I guess I'll assume I've never had the flu when I didn't go for the shot, but I've been getting the shot for the past 5 years or so, and I've never got it after either. So I have no idea how effective it is, but I just get it since it doesn't hurt to take another preventative measure.
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