Integrated Microfluidic Sample-to-Answer System for Direct Nucleic Acid-Based Detection of Group B Streptococci in...

Area of Science:

• Biomedical Engineering
• Molecular Diagnostics
• Microfluidics

Background:

• Group B Streptococcus (GBS) poses significant health risks to mothers and infants.
• Current diagnostic methods (bacterial culture, PCR) are slow and complex.
• Rapid and accurate GBS detection is critical for timely intervention.

Purpose of the Study:

• To develop an integrated microfluidic system for rapid nucleic acid-based GBS detection.
• To demonstrate a novel dynamical reaction mechanism for GBS nucleic acid amplification.
• To enable sample-to-answer GBS detection directly from clinical samples.

Main Methods:

• Established an integrated microfluidic system combining cell lysis, nucleic acid purification, amplification, and detection.
• Utilized a novel Bst/FEN1-based nucleic acid amplification strategy.
• Validated the system using vaginal/anal swab samples.

Main Results:

• Achieved rapid analysis in approximately 45 minutes with 98% accuracy.
• Demonstrated a low detection limit (500 CFU/mL) and perfect specificity.
• Showcased excellent stability (CV < 3%) and anti-interference performance.

Conclusions:

• The developed microfluidic system offers a fast, accurate, and stable diagnostic tool for GBS detection.
• The novel amplification mechanism and integrated system show potential for broader pathogen detection applications.
• This technology can significantly improve clinical diagnostics for maternal and infant health.