Bacterial vaginosis (BV) is the most common of three vaginal infections that fall under the category known as vaginitis. The other two infections are trichomoniasis, a sexually transmitted disease, and the fungal infection commonly known as a yeast infection.
BV is the least understood and most often ignored or misdiagnosed of these conditions. However, it is gaining more attention as more research shows that untreated BV can lead to significant health complications, including premature delivery, postpartum infections, clinically apparent and subclinical pelvic inflammatory disease (PID), post-surgical complications (after abortion, hysterectomy, cesarean section and other reproductive procedures), increased vulnerability to HIV infection and, possibly, infertility. As many as one-third of pregnant women in the United States have BV.