Various Respiratory Air Volumes Why Are Adults Getting Sicker And Sicker Than They Used To With Various Stomach And Respiratory "flus" ?

Why are adults getting sicker and sicker than they used to with various stomach and respiratory "flus" ? - various respiratory air volumes

When I was young, my parents never sick. I know many others who speak the same about their parents: never have a cold or flu for the year,
often a cold once a year

People everywhere more and more patients ..... and sicker and sicker
No idea why? (The White Stripes - subliminal message)