I read about the discussions around the subject, if CS kills or not the good bacteria. The claims are mixed.
The bacteria found in my case was not a lactobacillus. As soon as I can I will take a copy of the test to check the bacteria name; maybe that info may help in some way.
Doing a brain exercise... seems that there are some important difference between the bad and good bacteria. The exact difference that make one bad and the another good for the human health may be big enough to make one sensitive to CS while the another one is not affected. I do not know if this is correct or not, but in some way it make sense.