One-step species-specific high resolution melting analysis for nosocomial bacteria detection

Area of Science:

• Microbiology
• Molecular Biology
• Infectious Diseases

Background:

• Nosocomial infections pose a significant global health challenge.
• Early and precise identification of multidrug-resistant nosocomial pathogens is critical for effective treatment strategies.

Purpose of the Study:

• To develop and validate a novel real-time polymerase chain reaction coupled with high resolution melting-curve analysis (HRMA) assay.
• To enable rapid and specific identification of five key nosocomial bacterial pathogens.

Main Methods:

• The assay targets species-specific DNA regions for each bacterium.
• High resolution melting-curve analysis (HRMA) was employed to differentiate bacterial species based on distinct melting curve profiles.
• Real-time polymerase chain reaction (PCR) was used for amplification.

Main Results:

• The HRMA assay generated five unique melt curves, each corresponding to a specific bacterial species: Acinetobacter baumannii, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and methicillin-resistant Staphylococcus aureus.
• Characteristic melting curve peaks were observed for each species.
• The assay demonstrated high specificity and a detection limit of 2 × 10(-2) ng/μL.

Conclusions:

• The developed HRMA assay provides a simple, rapid, and accurate method for identifying selected nosocomial pathogens.
• This technique can significantly aid in the early diagnosis and management of hospital-acquired infections.