Methicillin-Resistant Staphylococcus aureus Nasal Swab Utilization as a Predictor for Methicillin-Resistant...

Area of Science:

• Infectious Diseases
• Clinical Microbiology
• Diagnostic Accuracy

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) infections pose significant health risks.
• Accurate and timely diagnosis of MRSA is crucial but can be challenging.
• MRSA skin and soft tissue infections (SSTIs) are a growing concern.

Purpose of the Study:

• To systematically review and meta-analyze the diagnostic performance of MRSA nasal swabs.
• To evaluate MRSA nasal swabs as a predictor for MRSA SSTIs.
• To determine the predictive values of MRSA nasal screening across different infection types.

Main Methods:

• Systematic search of electronic databases.
• Inclusion and analysis of data from 25 relevant studies.
• Calculation of diagnostic performance characteristics, including positive and negative predictive values.

Main Results:

• Overall negative predictive value for MRSA nasal swabs was 87%.
• Predictive values varied by infection type: 87% for mixed SSTIs, 91% for purulent infections, 87% for diabetic foot infections, and 79% for surgical site infections.
• Positive predictive values ranged from 48% to 77% across infection types.

Conclusions:

• MRSA nasal screening demonstrates a high negative predictive value for MRSA SSTIs.
• The utility of nasal screening is particularly notable in regions with low MRSA prevalence.
• Nasal swabs can be a valuable tool in the diagnostic workup of suspected MRSA infections.