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How much do you know about the flu?

A nurse practitioner wears personal protection equipment as she administers a flu vaccination at the CVS pharmacy on Sept. 3, 2020 in Key Biscayne, Florida.
A nurse practitioner wears personal protection equipment as she administers a flu vaccination at the CVS pharmacy on Sept. 3, 2020 in Key Biscayne, Florida. (Joe Raedle/Getty Images)

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