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Complex typing of methicillin-resistant Staphylococcus aureus (MRSA).
W Witte1, R R Marples, J F Richardson
1Institut für Experimentelle Epidemiologie, DDR, Wernigerode.
Zentralblatt Fur Bakteriologie, Mikrobiologie, Und Hygiene. Series A, Medical Microbiology, Infectious Diseases, Virology, Parasitology
|November 1, 1988
Summary
Differentiating methicillin-resistant Staphylococcus aureus (MRSA) strains from hospital outbreaks and sporadic infections requires advanced typing. Experimental phages, plasmid profiles, and patterns proved highly effective for accurate strain discrimination.
Area of Science:
- Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant threat in healthcare settings.
- Distinguishing between MRSA strains from outbreaks and sporadic infections is crucial for effective infection control.
Purpose of the Study:
- To evaluate the efficacy of a comprehensive typing scheme for discriminating MRSA strains.
- To identify the most valuable methods for differentiating MRSA from nosocomial outbreaks and sporadic infections.
Main Methods:
- A complex typing scheme was employed, including phage typing (International Basic Set, experimental phages 88-93, and 10 PHLS experimental phages), biochemical typing, resistance phenotype analysis, and plasmid profiling.
- Attribution of resistance determinants to the chromosome was also assessed.
Main Results:
- The combination of 10 experimental phages from the Public Health Laboratory Service (PHLS), plasmid profiles, and plasmid patterns demonstrated significant discriminative value.
- This multi-faceted approach effectively differentiated MRSA strains involved in nosocomial outbreaks from those in sporadic infections.
Conclusions:
- A sophisticated typing strategy incorporating specific experimental phages and plasmid analysis is essential for accurate MRSA strain differentiation in nosocomial settings.
- This methodology aids in understanding MRSA transmission dynamics and implementing targeted control measures.