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Diagnosing Kingella kingae infections in infants and young children
1a Clinical Microbiology Laboratory, Soroka University Medical Center , Ben-Gurion University of the Negev , Beer-Sheva , Israel.
Insights
Improved laboratory methods, including PCR assays, significantly enhance the detection of Kingella kingae, a common cause of bone infections in young children. These advanced techniques offer faster and more accurate diagnoses compared to traditional cultures.
Area of Science:
- Pediatric Infectious Diseases
- Clinical Microbiology
- Molecular Diagnostics
Background:
- Kingella kingae is a primary cause of skeletal infections in children aged 6-48 months.
- Traditional culture methods often miss K. kingae due to fastidious growth and inhibitory factors in clinical specimens.
- Early and accurate diagnosis is crucial for effective treatment of pediatric osteomyelitis and septic arthritis.
Purpose of the Study:
- To review and highlight improved laboratory methods for detecting Kingella kingae.
- To compare the efficacy of novel molecular techniques with traditional culture methods.
- To emphasize the impact of advanced diagnostics on pediatric skeletal infections.
Main Methods:
- Discussion of improved laboratory techniques, including blood culture vial inoculation and PCR-based assays.
- Analysis of PCR assays targeting the 16S rRNA gene and K. kingae-specific DNA sequences.
- Review of studies comparing molecular methods with conventional culturing for K. kingae detection.
Main Results:
- Blood culture vial inoculation improves K. kingae isolation by diluting inhibitory substances.
- PCR assays reduce detection time for K. kingae from 3-4 days to under 24 hours.
- 16S rRNA gene PCR improves diagnosis by 200%; real-time PCR targeting specific DNA sequences increases detection five-fold.
- Molecular methods enable diagnosis in patients receiving antibiotics and reduce culture-negative cases.
Conclusions:
- Novel PCR-based assays represent a significant advancement in diagnosing Kingella kingae infections in children.
- These methods offer superior sensitivity, speed, and diagnostic yield compared to traditional culture techniques.
- Improved detection facilitates timely management of skeletal infections caused by K. kingae in pediatric populations.
Introduction:
Kingella kingae is currently recognized as the prime etiology of skeletal system infections in children aged 6-48 months. The organism is notoriously fastidious, its growth is inhibited by synovial fluid and bone exudates, and its presence in clinical specimens is commonly missed by traditional culture methods. Areas covered: The present review discusses the use of improved laboratory methods to detect the organism in normally sterile body fluids, exudates, and upper respiratory tract specimens. Expert commentary: While inoculation of joint and bone exudates into blood culture vials dilutes the concentration of detrimental factors and significantly improves the isolation of the organism, novel PCR-based assays have enhanced sensitivity, shortened the time-to-detection of K. kingae from 3-4 days to <24 h, and enabled the bacteriological diagnosis in patients being administered antibiotic therapy. PCR-based assays that amplify the 16S rRNA gene results in a 200% improvement in the diagnosis of the organism compared to culture, whereas the use of real-time PCR tests that target K. kingae-specific DNA sequences increases the detection rate by a five-fold factor and reduces the fraction of culture-negative septic arthritis and osteomyelitis in infants and young children.
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