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.

  • $\begingroup$ key word "most" $\endgroup$
    – John
    Feb 6, 2019 at 20:45
  • $\begingroup$ What do you mean,I couldn't quite get you.Could you please elaborate. $\endgroup$ Feb 7, 2019 at 17:05
  • $\begingroup$ 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" $\endgroup$
    – John
    Feb 7, 2019 at 20:17


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