<prompt> Drug of choice for infection by Gardnerella vaginatis isAmpicillinMetronidazoleVancomycinCephalosporin  <response>: Ans is b ie Metronidazole Ref. Harrisons, 16e, p 767 15e, p 843Gardnerella vaginalis causes Bacterial vaginosis.Bacterial vaginosis can be differentiated from other vaginitis and diagnosed by Amsel criteria :White homogenous vaginal dischargeVaginal discharges pH 4.5Liberation of distinct fishy odour on mixing vaginal discharge with 10 solution of KOH.Microscopic demonstration of clue cells Vaginal epithelial cells coated with coccobacillary organisms 