Intestinal Carriage of Carbapenemase-Producing Organisms: Current Status of Surveillance Methods

Area of Science:

• Microbiology
• Infectious Diseases
• Clinical Diagnostics

Background:

• Carbapenemases confer broad-spectrum beta-lactam resistance in Gram-negative bacteria.
• Intestinal carriage of carbapenemase-producing organisms (CPOs) drives transmission.
• Effective detection of CPO carriers is crucial for infection control.

Purpose of the Study:

• To critically review methods for detecting intestinal carriage of CPOs.
• To evaluate the clinical performance, advantages, and disadvantages of available detection techniques.
• To inform infection control strategies by assessing diagnostic options.

Main Methods:

• Review of culture-based methods (e.g., CDC protocols, chromogenic media, specialized agars, double-disk synergy tests).
• Review of nucleic acid amplification techniques (NAATs) (e.g., real-time PCR, hybridization assays, loop-mediated isothermal amplification [LAMP]).
• Consideration of combined culture and NAAT approaches.

Main Results:

• Culture-based methods are accessible and cost-effective but may lack sensitivity and have long turnaround times.
• NAATs offer faster results, enhanced sensitivity, and specificity compared to culture methods.
• The choice of method depends on specific healthcare facility needs and infection control goals.

Conclusions:

• No single method is universally optimal for CPO carrier detection.
• Understanding the strengths and limitations of each diagnostic approach is essential for effective implementation.
• Optimizing CPO detection strategies can significantly impact infection control practices and limit bacterial spread.