It takes ~40 healthy people getting the flu shot to prevent one instance of illness. I'm surprised! @cochranecollab http://www.cochrane.org/CD001269/ARI_vaccines-to-prevent-influenza-in-healthy-adults …
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It takes ~40 healthy people getting the flu shot to prevent one instance of illness. I'm surprised! @cochranecollab http://www.cochrane.org/CD001269/ARI_vaccines-to-prevent-influenza-in-healthy-adults …