6 months after flu vaccination, the efficacy drops to about
Posted on: October 5, 2021 at 13:36:53 CT
TigerMatt STL
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45% of what it was 2 weeks after vaccination.
It's why the CDC doesn't recommend the flu vaccine until September/October.
"Getting vaccinated in July or August is too early, especially for older people, because of the likelihood of reduced protection against flu later in the flu season. September and October are good times to get vaccinated."