Development of a Multiplexed qPCR Kit for the Detection of Bloodstream Infection

Area of Science:

• Molecular diagnostics
• Infectious disease detection
• Genomics

Background:

• Bloodstream infections (BSIs) cause significant global morbidity and mortality.
• Current BSI diagnosis via blood culture is slow, taking over 48 hours.
• Cell-free DNA (cfDNA) analysis offers a potential rapid diagnostic approach.

Purpose of the Study:

• To develop and evaluate a novel multiplexed fluorescent quantitative PCR kit for plasma microbial cfDNA detection.
• To assess the diagnostic accuracy and efficiency of the developed kit for BSIs.

Main Methods:

• Designed PCR primers and probes based on next-generation sequencing data from BSI patients.
• Validated primer/probe specificity and conservativeness using bioinformatics and experimental methods.
• Determined the kit's lower detection limit and tested its accuracy on clinical samples.

Main Results:

• The quantitative PCR kit achieved a lower detection limit of ≤12 copies per reaction.
• Clinical testing demonstrated 90.48% consistency between the kit and traditional blood culture methods.
• The kit covers multiple common BSI pathogens including E. coli, K. pneumoniae, and S. aureus.

Conclusions:

• The developed kit offers a rapid, accurate, and reliable method for diagnosing bloodstream infections.
• This cfDNA-based approach can expedite etiological diagnosis and guide clinical treatment decisions.
• The diagnostic tool has the potential to significantly improve patient outcomes for BSIs.