This type of shit just drives away intelligent people from the community
(media.scored.co)
India has infrastructure, they have numerous water and waste treatment plants, so I suspect that shit isn’t getting into their reservoirs, or into the glacial ice melt that provides water to those reservoirs. So even they live like animals shitting everywhere, the water they’re drinking is generally free from human shit. As for sub Saharan Africa, they have almost no infrastructure, and I bet in the few places where they have a water treatment plant, the population who uses that water for their daily consumption and activities probably doesn’t have an issue with polio.