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://www.webmd.com/lung/news/20200902/how-effective-is-the-flu-vaccine?src=RSS_PUBLIC
Wednesday, September 2, 2020
How Effective is the Flu Vaccine?
from WebMD Health https://www.webmd.com/lung/news/20200902/how-effective-is-the-flu-vaccine?src=RSS_PUBLIC
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