China, India and Pakistan are desperately poor, brutally overcrowded countries. I doubt most of the people can do any better. I bet the people - that make it to adulthood - have incredible immune systems.
I dated an Indian woman (who was raised in Guyana S.A.), years ago. She was not dirty anywhere that I could find. :)
Personally the Chinese are as clean as anyone else in the world. Same with Indians.
I MEANT TO SAY that their countries are filthy. China is the filthiest country in the world. You KNEW that, though, and are just making trouble.
अलविदा.