If you’re looking into recurrent BV causes, you may wonder whether an ongoing sexual partner should be treated too. Recent trials have renewed interest in that approach, but pooled results have not established that treating male partners routinely prevents BV from returning. US guidance has shifted toward addressing partner therapy; what is recommended where you live may differ.
What Recurrent BV Causes Can—and Cannot—Tell You
Bacterial vaginosis (BV) is a change in the balance of bacteria in the vagina, not simply an infection caused by one germ. It can return for several reasons, including bacteria persisting after treatment, changes in the vaginal microbiome, or bacteria being exchanged during sex. These possibilities can’t usually be distinguished from symptoms or routine tests.
A 2021 review by Lenka A. Vodstrcil and colleagues noted that more than half of affected women may have BV return within six months of recommended antibiotic treatment. That is a population estimate, not a prediction for you. A recurrence also does not prove that a partner caused it: BV is not a straightforward sexually transmitted infection, and more than one process may be involved.
What Recent Partner-Treatment Trials Found
A February 2026 systematic review and meta-analysis by Laila Leite Pacheco Vieira and colleagues combined six randomized trials involving 953 couples. The studies compared treatment for adult women with BV alone against treatment for the woman and her male partner. Overall, partner treatment did not significantly reduce recurrence: the pooled relative risk was 0.97, with a 95% confidence interval of 0.76 to 1.22. In plain terms, the estimate was close to no difference, and the range leaves room for either benefit or no benefit.
A second meta-analysis, published in June 2026 by Zainab Aliyu Attahir and colleagues, included eight randomized trials and also found no significant overall reduction in recurrence. The trials did not all use the same partner-treatment regimen. A 2025 trial by Vodstrcil and colleagues was the only one in the February review to use combined oral and topical treatment for the male partner. The June review noted a possible benefit among couples who fully followed treatment, particularly with intensive regimens, but that signal needs more study; it does not establish that routine treatment works for everyone.
Taken together, these reviews do not show a dependable overall benefit from male-partner treatment across the regimens tested. They also do not settle whether a particular combined regimen, completed by both partners, could help a selected group. The findings concern male partners in the studied couples; they cannot tell you whether partner treatment helps in other kinds of partnerships.
Why Recommendations Differ
Older guidance generally did not recommend treating male partners, reflecting earlier trials that had not shown consistent benefit. In October 2025, the American College of Obstetricians and Gynecologists (ACOG) issued a focused US clinical practice update on concurrent sexual partner therapy for BV, in light of newer research and evidence about sexual exchange of bacteria. That is a change in the US guidance conversation, not proof that every partner should be treated or that recurrence will be prevented.
ACOG’s update is not a global standard. If you live in the UK, EU or Australia, ask your clinician or sexual-health service what local guidance currently recommends rather than assuming the US approach applies. Recommendations may also change as evidence develops.
What To Discuss With Your Clinician
If BV keeps returning, ask about confirming the diagnosis, treatment options for recurrence and whether concurrent treatment of your ongoing partner is appropriate under local guidance. The trial evidence mainly concerns adult women with BV and male partners; it does not establish an approach for female partners or other partnership types. Treatment should be a shared, non-blaming decision—not a test of fidelity or proof of transmission. If symptoms return or you are unsure what is causing them, a clinician can assess your situation and discuss next steps.