How Effective is the Flu Vaccine?
Since health officials started tracking it in 2003, effectiveness of the flu shot has varied from year to year, averaging at 40%.
from WebMD Health https://ift.tt/3lHSFEw
from WebMD Health https://ift.tt/3lHSFEw
from WebMD Health https://ift.tt/3lHSFEw
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