I. Treatment of BV 1. Indications for treatment: symptomatic patients, patients before gynecologic and obstetric surgery, asymptomatic pregnant women. 2. Specific regimen: (1) Preferred regimen: metronidazole 400 mg orally twice daily for 7 d; or metronidazole vaginal suppository (tablet) 200 mg once daily for 5-7 d; or 2% clotrimazole cream 5 g. Apply vaginally once a night for 7 d. (2) Alternative regimen: clotrimazole 300 mg orally twice daily for 7 d. (3) Agents to restore normal vaginal flora are available. (2) Treatment of BV during pregnancy and lactation (a) Treatment options 1. Pregnancy: (1) Preferred option: metronidazole 400 mg orally twice daily for 7 d. (2) Alternative option: cloroxomycin 300 mg orally twice daily for 7 d. The application of metronidazole during pregnancy requires implementation of the principle of informed choice. (2) Lactation: choose local medication and avoid systemic medication as much as possible. (ii) BV screening during pregnancy No routine screening of pregnant women for BV is required. III. Treatment of sexual partners No need to routinely treat sexual partners. If symptoms disappear after treatment, follow-up is not necessary. Follow-up of treatment effect is required for combined BV in pregnancy.