Here's my anecdotal data.

Posted by C at 11:44pm Aug 6 '09
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The only year I got sicker than a dog with the flu, was the first year in my lifetime that I got a flu vaccine.

Any other time, I get sick, it's never really bad but last ~4 days, tops.

Actually, I get colds more often since 2006 (when I got that flu vaccine), than ever before.

I'll never get another flu vaccine ever again.