Dalits of India
https://www.cnn.com/2018/05/17/health/crypto-bacteria-swimming-pools-hot-tubs-cdc/index.html https://www.yahoo.com/lifestyle/mothers-warning-goes-viral-four-year-old-daughter-develops-sepsis-trying-shoes-without-socks-202857769.html The reason why Dalits were not allowed in to society is very simple to understand. Up until very recently humans followed the profession they were born in to. For the most part. And societal laws ALWAYS account only "for the most part". Not for exceptions. Dalits traditionally cleaned human and animal waste or cleared dead bodies. Both these professions by definition expose these populations to many diseases. Now we don't know how far back these groups of people were given these jobs and why they accepted them in the first place. But I am positive that at some point societies realized that when people with these professions mix with the general population, drink from the same water sources as the general population does, people were con