Interesting theory @sheepdog and I'll check out the argument but you can do a simple test. Go to Mexico, drink only bottled water for 3 first days, then drink 1 glass of tap water each day for 3 days and see what happens!
RE: How We Get Sick / Catch Disease / Develop Illness and What To Do About It
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How We Get Sick / Catch Disease / Develop Illness and What To Do About It