Positive sialidase is usually indicated when a routine vaginal leukorrhea test is done, suggesting the possibility of bacterial vaginosis. Sialidase is produced by the vaginal flora of Gardnerella and other anaerobic bacteria. When the normal balance is disturbed, these sialidase-causing bacteria multiply, eventually leading to bacterial vaginosis. Patients with bacterial vaginosis can be treated by washing the vulva and vagina with lotions and placing levofloxacin vaginal effervescent tablets. However, the medication should be used under the supervision of a doctor to avoid risks. In addition, during the treatment period need to prohibit sexual intercourse, pay attention to personal hygiene, wash the vulva and change underwear every day.