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A flu shot is a vaccine, right? But they seem to be far less reliable than other vaccines (I know many people who get flu shots each year then get the flu). What is the reason for this, and are flu shots really that important?

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A flu shot is a vaccine, right? But they seem to be far less reliable than other vaccines (I know many people who get flu shots each year then get the flu). What is the reason for this, and are flu shots really that important?	9248