Ward-specific rates of nasal cocolonization with methicillin-susceptible and -resistant Staphylococcus spp. and...

Area of Science:

• Clinical microbiology
• Infectious disease epidemiology
• Hospital infection control

Background:

• Nasal colonization by Staphylococcus aureus is a key risk factor for infections.
• Co-colonization with methicillin-susceptible Staphylococcus aureus and methicillin-resistant coagulase-negative staphylococci (MRCoNS) is common in healthcare settings.
• Understanding colonization patterns is crucial for effective infection control.

Purpose of the Study:

• To investigate the variability of nasal co-colonization rates between different hospital wards.
• To assess the impact of such co-colonization on the performance of molecular methicillin-resistant Staphylococcus aureus (MRSA) screening tests.

Main Methods:

• Patient samples collected from different hospital wards.
• Molecular assays used for detection of Staphylococcus aureus and coagulase-negative staphylococci.
• Analysis of co-colonization prevalence and its correlation with MRSA screening test results.

Main Results:

• Significant variations in nasal co-colonization rates were observed among patients across different hospital wards.
• The presence of co-colonization influenced the sensitivity and specificity of molecular MRSA screening tests.
• Test performance varied depending on the specific molecular methods and targets employed.

Conclusions:

• Hospital ward environment influences nasal co-colonization patterns.
• Co-colonization poses a challenge for accurate molecular MRSA detection.
• Optimized screening strategies are needed to account for co-colonization variations.