Why does a flu vaccine not prevent you from getting the flu for the rest of you life like other vaccines?

Question

Why does a flu vaccine not prevent you from getting the flu for the rest of you life like other vaccines?

Answer 1

The virus responsible for the flu mutates very often (over 120 different flu strains) and a vaccine that is effective one year against a particular strain may not be effective the following year if it is a different strain.

Answer 2

One of the reasons is ecause the influenza virus mutates and changes in a way that previous vaccines would not work.

Flu vaccines are made of the current strain of the virus.  It is treated and rendered inactive enough that it should not harm you but enough so that your immune systems can detect it fight it off and know what to do when it finds the virus again.

Answer 3

evolution..

the flu virus you just got innoculated for changes to become resistant to that innoculation.. so that the T and B cells in your body dont recognise it as the same pathogen