Is Your Hospital Safe? Comparing the Best Methods for Detecting Antibiotic-Resistant Superbugs
"A New Study Shows How to Quickly Identify Carbapenemase-Producing Bacteria to Prevent Deadly Infections"
In today’s healthcare landscape, the rise of antibiotic-resistant bacteria, often called “superbugs,” poses a significant threat. Carbapenemase-producing Enterobacteriaceae (CPE) are particularly concerning. These bacteria have developed resistance to carbapenems, which are often the last line of defense against severe infections. The spread of CPE can lead to increased morbidity, mortality, and considerable strain on healthcare resources.
The ability to rapidly detect CPE is crucial for implementing effective infection control measures. Early identification allows hospitals to isolate affected patients, prevent further transmission, and administer appropriate treatment. Traditional detection methods can be slow, prompting the need for faster, more reliable screening techniques.
A recent study published in the Revista Chilena de Infectología evaluated three different screening methods for detecting CPE in rectal swabs. This research offers valuable insights for hospitals seeking to improve their detection strategies and safeguard patient health.
The Global CRE Threat
Transmissible carbapenem resistance in Enterobacteriaceae has been recognized for two decades, while global dissemination of carbapenemase-producing Enterobacteriaceae has accelerated more recently. CRE resistance can arise through carbapenemases, porin changes, efflux pumps, penicillin-binding protein alterations, and biofilm production. The CDC reports that carbapenemase-gene detection varies by organism and is influenced by antibiotic use, environmental persistence, infection-control practices, and regional spread.
From Resistance to Clinical Threat
CRE refers to Enterobacteriaceae resistant to carbapenem antibiotics, often through carbapenemase-producing genes identified in environmental reservoirs including water, animals, food, and soil. CRE emerged as a major threat to modern medicine because commonly used antibiotics are generally inactive against these organisms. Carbapenemase-producing Enterobacteriaceae are especially important because timely laboratory detection is essential, while rapid geographic spread and resistance to many alternative antibiotics intensify the danger.
Decoding the Study: Comparing CPE Screening Methods
The study, conducted at Fundación Clínica Shaio in Colombia, prospectively compared three methodologies for CPE detection using 73 rectal swabs from patients admitted to various hospital units, including the emergency department, intensive care unit (ICU), and cardiovascular care unit (CCU). Each method was assessed for its ability to accurately and rapidly identify CPE-producing bacteria.
- Method 1: ChromID CARBA® Agar: A chromogenic agar that allows for the direct recovery of carbapenem-resistant organisms from rectal swabs. This method uses antimicrobials to inhibit accompanying microbiota and contains chromogens that facilitate the presumptive identification of microorganisms. Results are typically available within 24 to 48 hours.
- Method 2: HB&L Carbapenemase Kit®: This kit uses vials with a nutritive broth, carbapenemics, and antifungals. It employs laser nephelometry in the HB&L® equipment to provide a bacterial count of resistant bacteria. This method detects carbapenemase-producing microorganisms in rectal swab samples in a maximum of 6 hours.
- Method 3: Xpert CARBA-R®: A rapid, real-time polymerase chain reaction (PCR) technique that detects carbapenemase-producing microorganisms in about 1 hour directly from rectal swab samples. The GeneXpert® equipment uses specific probes to reveal the presence of genes encoding carbapenemases, such as KPC, VIM, IMP-1, NDM, and OXA-48.
Current Research Directions
A 2025 systematic review examined oral antibiotics as a decolonization strategy for intestinal CRE carriage. The review describes CRE infections as associated with increased mortality and higher healthcare costs in hospitalized patients, supporting interest in decolonization approaches. In a retrospective study from a tertiary hospital in Havana, Cuba, metallo-beta-lactamase was detected in all 124 CRE isolates, with NDM-type carbapenemase dominant; three isolates coproduced KPC-type enzyme and showed high resistance to all antibiotics except colistin.
Choosing the Right Method for Your Hospital
The study’s findings highlight the strengths and weaknesses of each screening method. While the ChromID CARBA® agar offers high sensitivity and ease of use, it requires a longer incubation period. The HB&L Carbapenemase Kit® provides rapid results but may have lower sensitivity. The Xpert CARBA-R® offers excellent specificity and rapid detection but comes at a higher cost. Ultimately, the choice of screening method will depend on the specific needs and resources of each healthcare facility. Factors to consider include the prevalence of CPE in the region, the availability of laboratory equipment and expertise, and the budget for infection control.
The Hospital-Level Reality
A 2026 study describes carbapenem-resistant Enterobacterales as a major global public-health concern and carbapenemase-producing Enterobacterales as a severe clinical threat. It focuses on infections in secondary hospitals, where epidemiological data remain scarce. The study aims to characterize carbapenemase phenotypes and antimicrobial patterns, highlighting the need for better real-world surveillance outside major tertiary centers.