Rapid Detection of VanA/B-Producing Vancomycin-Resistant Enterococci Using Lateral Flow Immunoassay

Area of Science:

• Clinical microbiology
• Infectious diseases
• Diagnostic assay development

Background:

• Vancomycin-resistant enterococci (VREs) are significant nosocomial pathogens causing increased healthcare costs, prolonged hospital stays, and high mortality.
• Rapid detection of VREs is critical for effective infection control, outbreak prevention, and timely patient management.
• The VanB resistance gene is a key determinant in VRE infections.

Purpose of the Study:

• To evaluate the performance of the NG-Test VanB lateral flow immunoassay for the rapid detection of VanB-producing VREs.
• To assess the sensitivity and specificity of the NG-Test VanB assay.
• To determine the utility of the NG-Test VanB for clinical microbiology laboratories.

Main Methods:

• Evaluation of the NG-Test VanB assay using 104 well-characterized enterococcal isolates.
• Bacterial cells were grown in the presence of vancomycin to induce VanB expression.
• Comparison of NG-Test VanB results with established methods for VRE detection.

Main Results:

• The NG-Test VanB demonstrated 100% sensitivity and 100% specificity for detecting VanB-VREs when vancomycin was used as an inducer.
• The assay provides rapid results in under 15 minutes from colonies.
• The test is suitable for use with positive blood cultures after a short sub-culturing step.

Conclusions:

• The NG-Test VanB is an efficient, rapid, and easy-to-implement assay for confirming VanB-VREs from bacterial colonies.
• This test, along with NG-Test VanA, can effectively replace existing methods for detecting acquired vancomycin resistance in enterococci.
• Rapid VRE detection facilitates better management of infected patients and carriers, potentially reducing VRE spread.