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Methicillin-resistant Staphylococcus aureus: long-term routes of acquisition in hospital patients
1Laboratory Service, Veterans Administration Medical Center, Oklahoma City, OK 73104.
Abstract:
Five hundred fifty three patients and two personnel (1986-1991) were categorized according to acquisition route of methicillin-resistant Staphylococcus aureus (MRSA) and initial culture date. Of the 555, there were 218 with nosocomial infections, 100 with nosocomial colonizations, 92 with community-acquired infections, and 145 with community-acquired colonizations. Nosocomial infections occurred significantly more often than nosocomial colonizations, community-acquired infections, or colonizations (p < 0.001). Results of this study show that over a long period, our patients acquired MRSA by different routes, none of which were related to seasons of the year. Although seasonal outbreaks of epidemic MRSA are important, an awareness of the occurrence of endemic MRSA is also important because it serves as a reminder that MRSA reservoirs are continuously present in some institutions.
Insights
This study found methicillin-resistant Staphylococcus aureus (MRSA) acquisition routes in patients varied, with nosocomial infections being most common. Endemic MRSA reservoirs are continuously present, regardless of season.
Area of Science:
- Infectious Diseases
- Clinical Microbiology
- Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant public health threat.
- Understanding MRSA acquisition routes is crucial for effective infection control.
- Previous research has highlighted seasonal patterns in some MRSA outbreaks.
Purpose of the Study:
- To categorize MRSA acquisition routes in a patient population over a defined period.
- To investigate potential seasonal variations in MRSA acquisition.
- To assess the prevalence of different MRSA infection and colonization types.
Main Methods:
- Retrospective analysis of 555 patients and personnel data from 1986-1991.
- Categorization based on MRSA acquisition route (nosocomial vs. community-acquired) and type (infection vs. colonization).
- Statistical analysis to determine the significance of different acquisition routes.
Main Results:
- Nosocomial infections (218 cases) were significantly more frequent than nosocomial colonizations (100), community-acquired infections (92), and community-acquired colonizations (145).
- MRSA acquisition occurred via diverse routes over the study period.
- No significant relationship was found between MRSA acquisition and seasons of the year.
Conclusions:
- MRSA acquisition in patients occurs through multiple pathways, with nosocomial infections being predominant.
- The study underscores the continuous presence of endemic MRSA reservoirs in healthcare settings.
- Awareness of endemic MRSA is vital, complementing the understanding of epidemic outbreaks.