I'm not sure what you're basing your assertion on, but the estimated number of symptomatic flu illnesses ranges from 9.3 million to 45 million annually over the

I'm not sure what you're basing your assertion on, but the estimated number of symptomatic flu illnesses ranges from 9.3 million to 45 million annually over the past decade, which as I said is roughly from between 3 and 15% of the US population. https://www.cdc.gov/flu/about/burden/past-seasons.html https://www.cdc.gov/flu/about/burden/past-seasons.html