Colon have slightly different environment that stomach and duodenum. Ph, hcl, h concentrations etc. So poop comes with bacteria that otherwise won’t be in the upper GI like faecalis enterobacter etc. and if you eat it, that bacteria will colonized and more likely infected the stomach making you sick. Hep A can be present in fecal matter and spread through water once it is contaminated with feces. In 3rd world country it is a big problem, especially in schools we’re students eat street food outside that was not prepared under standard practices.
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