<prompt> Positive whiff test is seen in -Bacterial vaginosisCandidiasisChlamydiasisTrichomoniasis  <response>: Ans. is a i.e., Bacterial vaginosis Bacterial vaginosisvaginitis BV is a common vaginal infection.Etiology BV is caused by an imbalance and decrease in the naturally occurring bacteria of the vagina. In BV the number of the normal lactobacilli Doderleins bacilli decreases with simultaneous increase in concentration of other types of bacteria, especially anaerobic bacteria. The causative organisms which act synergistically are:i Gardnerella vaginalisii Ureaplasma urealyticumiii Mycoplasma hominisiv Peptococcus and mobiluncus.Clinical Features Moderate, malodorous, grayish white homogenous discharge, adherent to vaginal wall No evidence of vaginal inflammation.Diagnosis AMSELS criteria are used. Any three out of four should be present.1 Grayish white discharge2 Vaginal pH 4.7 alkaline3 Drop of discharge mixed with 10 KOH Fishy odor due to release of amines,acridine, and putredine Whiff test4 Smear prepared with normal saline: Clue cells vaginal epithelial cells covered with coccobacilli and the cells appear as stippled or granular. Clue cells are diagnostic of BV.Treatment Metronidazole 400 mg thrice a day for 5-7 days is the drug of choice Locally clindamycin and metronidazole gel can be used 