I agree with your view that flu shots are over-hyped. Since all these researches are done by the pharmaceutical companies and said to be double blind randomized controlled trials, the results may be biased and perhaps a tool to scare the people. The lay man go by what doctors say. And doctors may go by what their peers or researches mention, and none may go in the depth of the conclusions.
Here is a big study and conclusion is reproduced with the reference link:
Influenza vaccines can provide moderate protection against virologically confirmed influenza, but such protection is greatly reduced or absent in some seasons. Evidence for protection in adults aged 65 years or older is lacking. LAIVs consistently show highest efficacy in young children (aged 6 months to 7 years). New vaccines with improved clinical efficacy and effectiveness are needed to further reduce influenza-related morbidity and mortality.
Here is one of the biggest and latest research with reference and conclusions (it specifically mentions that need it is ineffective and results are biased;
Does the seasonal trivalent influenza vaccine (flu shot) prevent influenza or its complications in adults and seniors?
For healthy adults, the flu shot reduces the influenza rate when the vaccine is well matched (number needed to treat [NNT] of 12 to 37). A poorly matched vaccine has diminished effectiveness. For community-dwelling seniors, the NNT to prevent 1 case of influenza is 40. The flu shot has not been shown to decrease hospitalizations. Evidence that the flu shot decreases mortality is likely biased.
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