Related Experiment Videos
Identification of Aerococcus urinae in urine samples
1A/S Telelab, Pb 1868 Gulset, 3703 Skien, University of Tromsø, Tromsø, Norway.
Summary
Standard urine culture identification methods for Aerococcus urinae are unreliable. BBL-Crystal-GP and 16s rRNA sequencing accurately identify this bacterium, suggesting a need to revise current diagnostic protocols.
Area of Science:
- Clinical Microbiology
- Bacteriology
- Diagnostic Accuracy
Background:
- Accurate identification of urinary pathogens is crucial for effective patient treatment.
- Aerococcus urinae is an increasingly recognized cause of urinary tract infections.
- Existing diagnostic methods for A. urinae require evaluation for clinical utility.
Purpose of the Study:
- To assess the reliability of published identification procedures for Aerococcus urinae.
- To compare conventional methods with molecular (16s rRNA sequencing) and phenotypic (BBL-Crystal-GP) techniques.
- To determine optimal methods for accurate A. urinae identification in clinical urine samples.
Main Methods:
- Analysis of 24 alpha-hemolytic, non-enterococcal isolates from 4373 urine samples.
- Comparison of standard identification tests against 16s rRNA gene sequencing.
- Utilized BBL-Crystal-GP biochemical profiling for isolate characterization.
Main Results:
- Both 16s rRNA sequencing and BBL-Crystal-GP correctly identified 13 A. urinae isolates.
- Published identification methods failed to differentiate A. urinae from other bacteria, showing poor discrimination.
- Ciprofloxacin/trimethoprim susceptibility and growth at 45°C enhanced discrimination capabilities.
Conclusions:
- Current standard procedures for identifying Aerococcus urinae in urine are inadequate and require revision.
- BBL-Crystal-GP offers an accurate and reliable alternative for A. urinae identification.
- Molecular and enhanced phenotypic methods are superior for distinguishing A. urinae in clinical settings.