Geographic Variation in Diagnostic Performance of Amsel Criteria and Nugent Score for Vaginal Dysbiosis Defined by 16S rRNA Gene Sequencing.
Meilin Zhu, Andile Mtshali, Gugulethu Mzobe et al.
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In 30 seconds
This analysis compared Amsel criteria and Nugent scoring with 16S rRNA sequencing-defined vaginal community state types in screening and follow-up specimens from a Phase 1b randomized trial at sites in South Africa and the United States. Amsel-defined bacterial vaginosis was associated with CST IV-A and IV-B, but that association was significantly weaker at the South African site than at the US site. Nugent-defined BV showed stronger associations with both subtypes and no evidence of a site-specific interaction, suggesting more consistent performance across the two sites.
Key findings
- Amsel-defined BV was associated with CST IV-A and IV-B, but the association was significantly diminished at CAPRISA compared with MGH.
- Nugent-defined BV had stronger associations with CST IV-A and IV-B and showed no evidence of a site-specific interaction.
Why it matters
Diagnostic classification can affect who is identified as having vaginal dysbiosis and how study endpoints are defined. The observed site variation in Amsel associations suggests that results using this framework may be less comparable across settings. Nugent scoring showed more consistent associations across the two sites, relevant to research evaluating dysbiosis and preventive interventions.
What to keep in mind
The comparison involved two sites and specimens from a Phase 1b trial; the abstract does not report diagnostic performance estimates or establish how well the findings generalize beyond these settings.