Hi Kir. I had the same thing told to me. But it is about the balance. Something is f'ing that up. I have seen yeast infected with e-coli, so it is possible the yeast is "sick" It would complicate things.
In this case there is little solution except to destroy both. The yeast would normally be able to defend agaist this,[e-coli] but this is an unusual situation. The e-coli is aggressive, and likely addapted to hiding in yeast cells during past Antibiotic treatment.
Using Antibiotics alone in this case, may make the situation worst.
I wonder about introducing another species of yeast--bakers yeast or something that could "trick" the ecoli during therapy. This yeast would have a short life-spand and take out the bacteria with it---Just a crazy theory, but mention this to the specialists they may know a better idea.
Then there is maggot therapy--this make work very well. Look it up on google.
Shroom