Development and application of a triplex-PCR assay for rapid detection of methicillin-resistant Staphylococcus aureus...

Area of Science:

• Veterinary Microbiology
• Molecular Diagnostics
• Antimicrobial Resistance

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in livestock, necessitating rapid detection methods.
• Accurate differentiation of MRSA from other staphylococcal species is crucial for effective control strategies.

Purpose of the Study:

• To develop and validate a rapid, sensitive, and specific triplex-PCR assay for MRSA detection in porcine samples.
• To differentiate MRSA from methicillin-sensitive S. aureus and coagulase-negative staphylococci.

Main Methods:

• Development of a triplex-PCR assay targeting three specific genes: mecA, 16S rRNA, and nuc.
• Evaluation of the assay's sensitivity (detection limit of 10^2 CFU/ml) and specificity.
• Testing the assay on 79 MRSA isolates from pig samples.

Main Results:

• The triplex-PCR assay successfully amplified three distinct bands (280 bp for mecA, 654 bp for 16S rRNA, 481 bp for nuc).
• All 79 tested MRSA isolates yielded positive results, confirming the assay's effectiveness.
• No false-positive amplifications were observed, demonstrating high specificity.

Conclusions:

• The developed triplex-PCR assay is a powerful and reliable tool for the rapid and accurate detection of MRSA in pigs.
• This assay facilitates differentiation between MRSA and other staphylococcal strains, supporting veterinary diagnostics and surveillance.