BS - most years they hit maybe 30% - So are you always in the 30%? I'd say that 70% of the time you wouldn't have gotten it anyway.
BTW - Never had one and haven't had the flu, just so you know my odds - flew every week for work for the last 30 years and each of those weeks I worked in a different hospital. Probability is that I've been exposed to every strain there is, including CV-19 and nope, haven't got that either (that I know of).
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