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. Author manuscript; available in PMC: 2021 Jan 1.
Published in final edited form as: J Am Med Dir Assoc. 2020 Jan;21(1):25–28.e2. doi: 10.1016/j.jamda.2019.11.008

TABLE 2.

Influenza Vaccine Effectiveness Over Time

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While CDC began estimating influenza vaccine effectiveness annually in 2004–05, this slide captures data beginning in 2008–2009 when the U.S. Influenza Vaccine Effectiveness Network (U.S. Flu VE Network) began. Earlier estimates may not have been representative because they were from only one site.