Evaluation of a chromogenic agar under development to screen for VRE colonization

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Diagnostic Technology

Background:

• Vancomycin-resistant enterococcus (VRE) poses a significant healthcare challenge.
• Early detection of VRE colonization is crucial for infection control.

Purpose of the Study:

• To evaluate the performance of BBL CHROMagar VanRE (CVRE) for VRE colonization screening.
• To compare CVRE with a standard method using bile esculin azide agar plus vancomycin.

Main Methods:

• Prospective study comparing CVRE with bile esculin azide agar plus vancomycin.
• CVRE utilizes chromogenic substrates to differentiate enterococcal species.
• VRE colonization was the primary outcome assessed.

Main Results:

• CVRE demonstrated high sensitivity (98.6%) and specificity (99.1%) for VRE detection.
• Positive predictive value was 95.9%, and negative predictive value was 99.7%.
• CVRE effectively distinguishes Enterococcus faecalis (green) from Enterococcus faecium (mauve).

Conclusions:

• BBL CHROMagar VanRE is a reliable and accurate method for screening VRE colonization.
• The chromogenic properties of CVRE aid in rapid presumptive identification of VRE species.
• CVRE offers a valuable tool for improving VRE surveillance and infection control strategies.