It is rare but certainly possible, perhaps a restroom faucet or doorknob had been just contaminated and you were unlucky enough to touch it very soon thereafter and transfer it. It is always very important to thoroughly wash hands after using the bathroom. My doctor just informed me that I have bacterial vaginitis. Although women who are sexually active are more likely to develop bacterial vaginosis, the infection is not necessarily a sexually transmitted disease. Are there foods, alternative meds, herbs, etc.
Treatments are completely unsuccessful.
She also recommends using a variety of supplements, such as acidophilus and bifida factor, both intestinal biocultures. One is known as PB8, available in health food stores. Some physicians discourage caffeine and alcohol also. A second opinion could be in order. Sometimes this proves to be beneficial, especially in such a nagging condition.