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Methicillin-resistant Staphylococcus aureus (MRSA)--phage-typing of Malaysian and international isolates
1Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Malaysia.
Abstract:
Twenty-one isolates of methicillin-resistant Staphylococcus aureus (MRSA) from Malaysia (M-MRSA) derived from various sources associated with nosocomial infections were phage-typed and compared with 54 international isolates associated with epidemic and sporadic episodes of infections. It appeared that the majority of M-MRSA were non-typable by the international basic set of phages. Two (9.5%) were typed by phage 85. Phage-typing of MRSA revealed that the strains were almost completely restricted to phage groups III and a lesser portion to phage groups I and III.
Insights
Most Malaysian methicillin-resistant Staphylococcus aureus (MRSA) strains were untypable using standard international phage typing methods. This suggests unique characteristics of these nosocomial infection-causing MRSA isolates.
Area of Science:
- Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) is a significant cause of nosocomial infections worldwide.
- Phage typing is a standard method for classifying MRSA strains and tracking their epidemiology.
- Understanding the characteristics of local MRSA strains is crucial for infection control.
Purpose of the Study:
- To characterize methicillin-resistant Staphylococcus aureus (MRSA) isolates from Malaysia using phage typing.
- To compare Malaysian MRSA isolates with international strains to identify potential epidemiological links or unique features.
Main Methods:
- Twenty-one Malaysian MRSA isolates from nosocomial infections were subjected to phage typing.
- These isolates were compared against 54 international MRSA isolates.
- Phage typing utilized the international basic set of phages.
Main Results:
- The majority of Malaysian MRSA isolates were non-typable with the international phage set.
- Only two (9.5%) Malaysian MRSA isolates could be typed, both by phage 85.
- MRSA strains were predominantly restricted to phage groups III, with some in groups I and III.
Conclusions:
- Malaysian MRSA isolates exhibit distinct characteristics compared to international strains, as indicated by their resistance to standard phage typing.
- The prevalence of non-typable strains suggests the need for updated or specific phage typing sets for Malaysian MRSA.
- Further investigation into the genetic and epidemiological profiles of these unique MRSA strains is warranted.