My thought on this matter is that we have got a very high pH of about 1.8 in our stomach.So,most of bacteria who came in through food or just open mouth should be killed by it.So,how does a bacterial fauna builds up in caecum.
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$\begingroup$ key word "most" $\endgroup$– JohnFeb 6, 2019 at 20:45
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$\begingroup$ What do you mean,I couldn't quite get you.Could you please elaborate. $\endgroup$– Abner Alfred ThompsonFeb 7, 2019 at 17:05
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$\begingroup$ Your own words "most of bacteria who came in ... should be killed..." key word in that sentence is "most" Some preliminary research on your part is expected, I suggest googling "human gut flora" $\endgroup$– JohnFeb 7, 2019 at 20:17
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