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No_Constant8644 t1_jdd4p1j wrote

There are different strains of E. Coli. The strain in your gut is suited to that location and is kept in homeostasis within your body.

A different strain would not necessarily be kept in check by normal body processes and your immune system would likely see it as an illness thus causing the immune response (a.k.a. Symptoms of illness)

The same thing happens with yeast infections (e.g. thrush) yeast naturally lives on us, but when something causes our body’s to get out of balance it can allow for the yeast to multiply and take over where it normally would not.

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