A 27-year-old woman presents to the GP with recurrent bacterial vaginosis - she has had 4 episodes in the past year, each treated with metronidazole. She asks about prevention. Which is the single most evidence-based preventive measure?ADaily oral probiotics (Lactobacillus) have strong evidence for preventing recurrenceBThere is currently no highly effective long-term preventive strategy, though options to discuss include intravaginal metronidazole gel maintenance therapy (twice weekly for 4-6 months)CRegular vaginal douching to maintain pHDLong-term oral metronidazole 400 mg dailyESwitching to a different antibiotic class permanently prevents recurrenceCheck my answer