But once a person realizes exactly which symptoms go with which problem, it's fairly straight-forward. For yeast, the hallmark symptom beyond the presence of a discharge is irritation and/or itching. With bacterial vaginosis, those are not nearly as much in the picture. There is minimal inflammatory response from the vaginal lining cells (mucosa), and so one of the main symptoms is the volume of watery-gray/white drainage. Usually, it has an odor that people describe as "fishy" because of the effects of the bacterial metabolism. That's usually what brings them into my office.
Bacteria are normal in the vagina, but there is a certain type that is native - these are called lactobacilli - they literally are "good" bacteria and help maintain healthy vaginal acidity and prevent the overgrowth of "bad" or non-native bacteria. Those "bad" ones are really usually from another part of the person's anatomy such as skin and anus/rectum....I know...yuck! But still, at least they are one's own bacteria, for better or worse. The trouble comes when there are just too many of the abnormal bacteria such that the lactobacilli can't keep cleaning up.
Some tactics to keep the vaginal pH on the acid side are to use over-the-counter vaginal acidifying products like "Rephresh" - I have no proof that this particular product works, but the concept is sound. Also, using some type of antibacterial wet-wipe when toileting can reduce the overall bacterial load so close to the vaginal opening. Some of these products can be irritating and overly drying to the delicate skin in that zone, so you have to be choosy about which product you would use. Douching is a definite no-go...these "treatments" actually do more harm than good as far as promoting healthy pH and lactobacilli.
Intercourse does play a role in BV in that seminal fluid would potentially change the pH to less acidic and promote the conduction of a woman's own bacteria from a location outside the vagina to the inside. But strictly speaking, BV is not a sexually transmitted infection like gonorrhea, trichomonas or chlamydia. We really don't treat the male partner of a woman with even chronic or recurrent bouts of bacterial vaginosis, but we might tell the couple to try using condoms to see if that helps.
Diagnosis of BV happens in the doctor's office (not over the phone) where a simple preparation of cells from a vaginal swab can be analysed with a microscope. This will reveal whether or not there is overgrowth of abnormal bacterial relative to a less than normal complement of lactobacilli, a mixed infection with yeast or the presence of those pesky (and very strange looking) trichomonads. The acidity of the discharge can also be directly tested.
Treatment is in the form of cream, gel or tablet depending upon the patient's choice and any allergies to medication that might be present. I lean toward topical vaginal gel because it tends to hit the problem right at the source without disturbing the whole intestinal tract with antibiotic insult (like diarrhea or nausea). Also, the topical agent known as Metrogel is supposed to help preserve the "good" bacteria relative to the evil ones!