We don't know
70% of women have gardnerella vaginalis present in the vagina at any given time.
When it overgrows, it is called bacterial vaginosus (bv). 1 out of 10 women will experience recurrent overgrowths of that bacteria
for no obvious or known reason. When that occurs, we traet with antibiotics and continue a reduced dosing for prophylaxis
. That works for over 90% of the women having this problem.