It's important to remember that influenza vaccine protection starts very strong but declines throughout flu season as antibody levels wane.
A study published in Eurosurveillance on February 22, 2024, compiled data across nine flu seasons in Ontario, Canada, revealing that influenza vaccine effectiveness (VE) waned about 9% every 28 days beginning 41 days post-vaccination.
This trend was detected in adults but not in children.
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