Distinguishing Characteristics of E. coli Vaginitis
Clinical Presentation and Diagnosis
- Bacterial vaginosis (BV) produces a characteristic fishy or amine odor, particularly when 10% KOH is added, and is caused by anaerobic bacteria and Gardnerella vaginalis, NOT E. coli, as recommended by the Centers for Disease Control and Prevention (CDC) 1, 2
- The presence or absence of fishy odor is a key clinical clue: fishy odor suggests BV, while yellow discharge with inflammation but no fishy odor suggests aerobic vaginitis, according to the American College of Obstetricians and Gynecologists (ACOG) 2
- Vaginal pH >4.5 is present in both BV and aerobic vaginitis, but this alone doesn't distinguish them, as noted by the Infectious Diseases Society of America (IDSA) 1, 3
- Wet mount microscopy can help distinguish BV (clue cells) from aerobic vaginitis (cocci/coarse bacilli with leukocytes), as recommended by the CDC 1, 2