You have a scientist brain. I don;t have the guts. I KNOW we have them but just... well... figured how bad can it be? Probably worse then we think. Because NO ONE but NO ONE has suggested we de-worm in 50 years. My mother de wormed me when I was 3-4. NOTHING since. Do they even de-worm in Europe?
You know how to solve this problem.... all the Science teachers in schoolS should hAve their kids do this for extra credit....NOT REQUIRED....
We would get lots of families to call the doctors and get rid of them.