Regarding people who get the flu "anyway" even though they got a flu shot:
1. you're either that unusual (but not unheard of) case that got a strain of the flu that the shot doesn't prevent
or
2. you were already infected with the flu, and were in the process of getting sick by the time you got the shot (and weren't symptomatic yet). Considering that most people get the shot during flu season, it stands to reason that most people who "get the flu anyway" were already infected and therefore the shot didn't do them any good at all.
That's why you should get it right before the flu season begins, not in the middle of it. Late August (really late, like the last week) through early-mid September is optimum, since flu season runs through October and November.
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