Early is better: Some folks think the flu shot wears off over time & it does but over several years, not months. The problem with the flu is there are several (5-8) strains circling the globe at one time & they can only get stuff for 4 strains in the vaccine before it would weaken the power for each strain. They pick the most common strains, but that can change mid season so the vaccine sometimes misses.
Answered 9/11/2019
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