Infectious disease pop quiz: Clinical challenge #12 for the ObGyn

In patients with bacterial vaginosis, the vaginal pH typically is elevated in the range of 4.5. When a drop of potassium hydroxide solution is added to the vaginal secretions, a characteristic fishlike (amine) odor is liberated (positive “whiff test”). With saline microscopy, the key findings are a relative absence of lactobacilli in the background, an abundance of small cocci and bacilli, and the presence of clue cells, which are epithelial cells studded with bacteria along their outer margin.