By the way, doctor: What can I do about strep B vaginitis?
Group B streptococcus is not usually a cause of vaginitis. Even when strep B is found in a laboratory culture of vaginal discharge, it's hard to tell whether it's the culprit or just an innocent bystander, since it harmlessly colonizes the vagina in up to about one-third of women. If strep B is causing the symptoms, then a course of amoxicillin would be the right treatment. The fact that your discharge returned after taking amoxicillin suggests that the infection wasn't completely treated — or that other factors may be contributing to your symptoms. One possible cause is bacterial vaginosis — a condition in which there is an overgrowth of certain unhealthy bacteria, often causing a fishy odor. This condition may respond to amoxicillin, but metronidazole and clindamycin are more likely to cure it.
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