Next-generation microbiological testing in intraabdominal infections with PCR technology

Area of Science:

• Clinical Microbiology
• Infectious Diseases
• Molecular Diagnostics

Background:

• Intra-abdominal infections (IAI) are a growing global health concern, often caused by multi-drug resistant organisms (MDRO).
• Timely identification of pathogens and their antibiotic resistance is crucial for effective treatment of IAI.

Purpose of the Study:

• To evaluate the Unyvero A50® system for detecting microorganisms and antibiotic resistance in intra-abdominal infections.
• To compare the performance of the Unyvero A50® with conventional microbiology techniques.
• To identify clinical parameters associated with microbiological findings in IAI patients.

Main Methods:

• Prospective comparison of PCR-based Unyvero IAI cartridges with routine microbiology for 62 surgical patient samples.
• Analysis of clinical parameters, including C-reactive protein (CRP) levels, correlated with microbiological results.
• Statistical analysis using t-test and Mann-Whitney U test.

Main Results:

• The Unyvero A50® identified a greater number of microorganisms, including Bacteroides, Escherichia coli, and Enterococcus species.
• 100% concordance was observed between the PCR system and routine methods for detecting bacterial resistance (100% sensitivity, specificity, PPV, NPV).
• Higher CRP levels were associated with detectable microorganisms; more pathogens and resistance were identified in hospital-acquired IAI using the PCR system.

Conclusions:

• The Unyvero A50® system offers rapid detection of microorganisms and antibiotic resistance in intra-abdominal infections.
• This rapid identification facilitates timely adjustment of antibiotic therapy.
• Conventional microbiological culture remains essential for determining minimal inhibitory concentrations for optimal antibiotic selection.