Polio outbreaks hit throughout the summer, only during pesticide spraying times. (not the sunless and damp winter/spring seasons regarding other disease outbreaks)... 7. Polio had and has NO ability to spread from infected victims to the uninfected. Polio infected clusters of people in the exact same areas, suddenly and swiftly... 8. Parents report finding their children paralyzed in and around apple orchards. One of the most heavily pesticide sprayed crops of the time (with lead arsenate or copper arsenate) were apple orchards.
Polio? You mean DDT poisoning.
Deeper dive, here: https://www.greenmedinfo.com/blog/everything-you-learned-about-cause-polio-wrong