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The "flu shot" is actually weakened virus from several strains of flu that the Center For Disease Control (CDC) THINKS we may get this winter...so they manufacture that group of vaccines, and distribute it.
There is MILLIONS of influenza strains, and if one comes along that you are NOT vaccinated for in your flu shot, you will get sick.
You cannot be vaccinated for every flu strain...there is millions and as typical character of viruses, they can 'morph' and change and every time they do, your body has to immune against it all over again.
Viruses can morph...the strains can change constantly.
That is why they not only stay 'alive', but they can morph and bridge from animal flus to human flus (ZOONOSES)
The flu shot you had last year, maybe the same as this year only the bugs signature has morphed a bit and now looks like a different bug to your immunal system, and you must be immunized against that bug again...hope this helps explain.
There is not just A flu, there are hundreds, and each has alot of strains...the flu you got was probably one that was not in your flu shot.
I wanted to remark regarding my back comment on the Flue shot....Mine was said in jest. I am aware of all the information that was pointed out....I worked 15 years in medical records in a local clinic and hospital. It was actually a friend, who is a RN, who had never got a flu shot....she got one....got the flu. Of course it was some other strain or whatever the reason...she just thought it was ironic that the one year she gets the shot...she gets the flu. Again....my comments were all in jest, fun, humor, jolly, sarcasm....etc.
and so glad you and yours are doing better