This should be no surprise to anyone who had a shot, yet still got the flu. Protection against the major strain of flu this season was not included in the serum.
WASHINGTON – The influenza vaccine that many Americans clamored for this year was not very good at protecting people against influenza, colds and similar viruses, a preliminary report published Thursday shows.

I didn’t get the shot. I have had nary a sniffle so far this season. Coincidence? I say, no.
I’ve had the flu (the real thing, not just a cold) three times in my adult life. All three times were in the seasons that I got the flu shot. As a result I opt not to get the shot.
That’s just me.