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Melting temperature mapping method in children: Rapid identification of pathogenic microbes
Takashi Ishikawa1, Yoji Uejima2, Masashi Okai1
1Division of Immunology, National Center for Child Health and Development, Tokyo, Japan; Department of Pediatrics, Jikei University School of Medicine, Tokyo, Japan.
Summary
The melting temperature (TM) method offers rapid bacterial identification in children with bloodstream infections (BSI), showing high accuracy, especially in negative cases and even during antibiotic therapy.
Area of Science:
- Microbiology
- Molecular Diagnostics
- Pediatric Infectious Diseases
Background:
- The melting temperature (TM) mapping method utilizes intrinsic 16S ribosomal RNA gene (16S rDNA) melting temperature patterns for bacterial species identification directly from whole blood.
- This study explores the clinical utility of TM for bloodstream infections (BSI) in pediatric patients.
Purpose of the Study:
- To evaluate the clinical application of the TM method in diagnosing bacterial bloodstream infections in children.
- To compare the performance of TM with conventional blood culture (BC) methods.
Main Methods:
- A prospective observational study conducted at a children's hospital in Japan (2018-2021).
- Investigated match rates between TM and BC, time to identification, and bacterial DNA quantity in patients with suspected or diagnosed BSI.
- Included 81 patients (93 samples).
Main Results:
- TM demonstrated a high negative-match rate (97%) with BC.
- The overall match rate between TM and BC was 78%.
- TM provided identification in a median of 4.7 hours, significantly faster than BC, and could identify bacteria even after antibiotic administration.
Conclusions:
- TM shows promise as a rapid diagnostic tool for pediatric BSI, offering high accuracy in negative results.
- The method's ability to identify bacteria during antibiotic therapy and its speed present significant clinical advantages over traditional blood cultures.
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