For some people, getting a flu shot might be beneficial. If you are someone who doesn't get sick very often, it's probably a waste of time.
I'm wary of getting flu shots (for many people) because, it really just a vaccination for convenience. I won't say that vaccinations weaken our immune systems, but when our immune systems don't have to fight anything off, because we are vaccinated for everything, it's definitely not beneficial in the long run.
Anecdotal of course, but the people that worry about getting all their vaccination all the time are the people that always find themselves sick, and the people that try to avoid them are the people who rarely get sick, and when they get sick, it's over quickly.
Getting a vaccination for a disease that is more serious is a completely different matter. For most people, getting the flu isn't a serious disease.
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