A multiplex polymerase chain reaction-based diagnostic method for bacterial vaginosis

Area of Science:

• Microbiology
• Molecular Diagnostics
• Women's Health

Background:

• Bacterial vaginosis (BV) is a common vaginal dysbiosis with implications for reproductive health.
• Accurate and rapid diagnostic methods for BV are crucial for effective management.
• Current diagnostic methods, like Gram stain-based Nugent scoring, have limitations.

Purpose of the Study:

• To develop and evaluate a novel polymerase chain reaction (PCR)-based diagnostic assay for bacterial vaginosis.
• To identify specific bacterial vaginosis-associated anaerobes using multiplex PCR.
• To assess the diagnostic performance of the multiplex PCR assay compared to traditional Gram stain methods.

Main Methods:

• A multiplex PCR assay was designed targeting 16S ribosomal DNA (rDNA) of Mobiluncus species, nanH gene of Bacteroides fragilis, and rDNA spacer region of Gardnerella vaginalis.
• Vaginal swabs from pregnant and non-pregnant women were analyzed using both the multiplex PCR and Gram stain-based Nugent scoring.
• A total of 853 samples were initially assessed by Gram stain, with 172 Gram stain-interpretable samples selected for PCR analysis.

Main Results:

• The multiplex PCR assay demonstrated high diagnostic accuracy, with a sensitivity of 78.4% and specificity of 95.6% compared to Gram stain.
• The positive and negative predictive values for the PCR assay were 82.9% and 94.2%, respectively.
• The prevalence of bacterial vaginosis by Nugent scoring was 21.6%, with the multiplex PCR identifying 20.3% of samples as BV positive.

Conclusions:

• The developed multiplex PCR assay is a sensitive and specific tool for the diagnosis of bacterial vaginosis.
• This molecular method can serve as a valuable diagnostic or screening test for bacterial vaginosis in clinical settings.
• The PCR assay effectively detects key anaerobic bacteria associated with bacterial vaginosis.