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Microbiota Analysis Using Two-step PCR and Next-generation 16S rRNA Gene Sequencing
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Transportation protocols for accurate assessment of microbial burden classification using molecular methods.

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Developing a hybrid testing method for patient-side specimen collection and transport, this study enhances microbiological testing accuracy. It successfully differentiates contaminants from pathogens in urine and detects low pathogen levels in blood, improving point-of-care diagnostics.

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Area of Science:

  • Microbiology
  • Clinical Diagnostics
  • Biotechnology

Background:

  • Point-of-care testing (POCT) offers cost-effective and rapid diagnostics, crucial for pandemic preparedness and reducing hospital visits.
  • Current POCT faces limitations like skin flora contamination and insufficient specimen volume, hindering reliable microbiological testing outside clinical settings.
  • Accurate bacterial infection identification and antimicrobial susceptibility profiling are vital for effective patient management.

Purpose of the Study:

  • To develop and validate a hybrid testing procedure for patient-side specimen collection and transportation.
  • To enable molecular microbial classification and early identification of susceptibility profiles directly from whole blood or urine.
  • To optimize transportation conditions for direct-from-specimen viable pathogen detection, differentiating contaminants from true pathogens.

Main Methods:

  • Feasibility study involving testing of various transportation conditions (tubes, temperature, duration) for direct-from-specimen viable pathogen detection.
  • Evaluation of molecular assays for differentiating between contaminant and causative bacteria in urine specimens.
  • Assessment of optimal growth conditions for low-concentration blood specimens post-transportation.

Main Results:

  • Direct-from-urine assays successfully detected viable pathogens (≥10^5 CFU/mL) after transportation, while contaminants (≤10^4 CFU/mL) were not detected.
  • Direct-from-blood assays identified contrived blood samples with pathogen concentrations as low as 0.8 CFU/mL as positive after transportation.
  • The developed method demonstrated the potential to bypass traditional blood culture for early pathogen detection.

Conclusions:

  • The hybrid testing procedure shows feasibility for reliable patient-side microbiological specimen collection and transportation.
  • Optimized conditions enable accurate differentiation of pathogens from contaminants in urine and sensitive detection in blood.
  • This approach holds promise for improving early bacterial infection diagnosis and antimicrobial susceptibility testing in decentralized healthcare settings.