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Updated: Jun 12, 2025
Multiplex PCR Assay for Typing of Staphylococcal Cassette Chromosome Mec Types I to V in Methicillin-resistant Staphylococcus aureus
Published on: September 5, 2013
Diagnostic utility of nasal methicillin-resistant Staphylococcus aureus polymerase chain reaction testing in head and
Jake Smith1, Bailee Cummings2, Ryan K Dare1,3
1Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
Abstract:
In this retrospective study of adult inpatients who underwent an ear, nose, and throat (ENT) surgery with operative cultures and collection of nasal methicillin-resistant Staphylococcus aureus (MRSA) polymerase chain reaction (PCR), we found that MRSA nasal PCR demonstrated 100% sensitivity and a negative predictive value (NPV) of 100% when compared to operative cultures.
Insights
Nasal methicillin-resistant Staphylococcus aureus (MRSA) polymerase chain reaction (PCR) testing accurately identifies patients needing decolonization before ear, nose, and throat surgery. This MRSA nasal PCR test showed 100% sensitivity and 100% negative predictive value in our study.
Area of Science:
- Infectious Disease
- Surgical Microbiology
- Diagnostic Accuracy
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant risk for surgical site infections.
- Preoperative screening for MRSA is crucial for effective infection control protocols.
- Nasal carriage is a primary reservoir for MRSA transmission.
Purpose of the Study:
- To evaluate the diagnostic performance of nasal MRSA polymerase chain reaction (PCR) testing.
- To compare MRSA nasal PCR results with intraoperative cultures in patients undergoing ear, nose, and throat (ENT) surgery.
- To determine the sensitivity and negative predictive value (NPV) of MRSA nasal PCR.
Main Methods:
- Retrospective analysis of adult inpatients undergoing ENT surgery.
- Collection of nasal swabs for MRSA PCR analysis.
- Comparison of nasal PCR results with intraoperative cultures.
Main Results:
- MRSA nasal PCR demonstrated 100% sensitivity.
- MRSA nasal PCR achieved a 100% negative predictive value (NPV) when compared to operative cultures.
- The findings indicate high accuracy for nasal PCR in detecting MRSA.
Conclusions:
- Nasal MRSA PCR is a highly sensitive and specific diagnostic tool for identifying MRSA colonization in patients undergoing ENT surgery.
- The 100% NPV suggests that a negative nasal PCR result reliably excludes MRSA carriage.
- Implementing MRSA nasal PCR screening can enhance preoperative patient management and reduce surgical site infection risks.
