A lot more than just the elderly and infirm get the flu shot. I became a regular after we had a meeting of lour leadership with one of the top epidemiologist at the CDC in I think 2010--the H1N1 crisis. He said that getting the flu every year affords better protection in the case of something like the spanish flu or hong kong flu breaking out, as you gain a bit broader immunity with each year's shot. Each new strain is mostly recombined parts of earlier strains.
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