Wow. I never heard that before... once you get one "there's no turning back!" It's a different vaccine every year, so I highly doubt that it carries over year after year. That said, I have never gotten the flu in a year that I got the flu vaccine. I did get the flu one year when I didn't get the vaccine -- and it was a whopper. The vaccine protects against the actual flu -- that illness that last around 5 days with a very high fever, not against the various strains of colds and viruses that also circulate in winter and can make you draggy. Also, you might feel draggy and flu-ish for the day after you get the vaccine.
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