Comparison of two microscopic interpretations of vaginal microbiota with molecular profiling.

OBJECTIVE

To compare the diagnosis of bacterial vaginosis (BV) by Nugent scoring criteria (Nugent-BV) and the diagnosis of BV and/or aerobic vaginitis (AV) using Donders criteria (Donders-BV/AV) for identifying Molecular-BV detected by bacterial 16s rRNA profiling.

METHODS

We enrolled 512 women of reproductive age in Brazil with data available on Nugent and Donders microscopic analysis and 16S rRNA sequencing. We constructed receiver operating characteristic (ROC) curves of Nugent-BV and Donders-BV/AV and calculated their area under the curves (AUCs) and 95% confidence interval (CI) for matching Molecular-BV.

RESULTS

A total of 155 (28.7%) participants were positive for Nugent-BV. Donders-BV and -AV were detected in 90 (17.6%) and 75 (14.6%) participants, respectively, while 28 (5.5%) had concurrent Donders-BV and -AV. Molecular-BV was identified in 139 (27.1%) participants. Analysis of ROC curves showed that diagnosis of Nugent-BV more accurately aligned with presence of Molecular-BV (AUC: 0.88, 95% CI: 0.84-0.91) when compared to Donders-AV/BV (AUC: 0.84; CI: 0.80-0.87) (P = 0.005).

CONCLUSION

The use of Nugent-BV is more representative of Molecular-BV than Donders-AV/BV.