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Fingerprinting methicillin-resistant Staphylococcus aureus by the immunoblot technique
1Department of Medical Microbiology, St Bartholomew's Hospital, West Smithfield, London.
Abstract:
A series of 133 isolates of methicillin-resistant Staphylococcus aureus was fingerprinted by the immunoblot technique. Extracts were prepared by lysostaphin degradation of overnight cultures and peptides were separated by SDS polyacrylamide gel electrophoresis. The peptides were transblotted on to nitrocellulose membranes and probed with (1) a hyperimmune rabbit serum raised against a methicillin-resistant S. aureus isolate, (2) a hyperimmune rabbit serum raised against an isolate of S. epidermidis, and (3) serum from a patient who had recovered from an infection with a methicillin-resistant S. aureus. This typing method confirmed the existence of an epidemic strain that accounted for 102 of the isolates. The remaining 31 isolates were grouped into a further seven types which correlated with the results of phage typing and antibiograms.
Insights
This study used immunoblot fingerprinting to analyze methicillin-resistant Staphylococcus aureus (MRSA). The technique identified a dominant epidemic MRSA strain, aiding in understanding its prevalence.
Area of Science:
- Microbiology
- Infectious Diseases
- Molecular Biology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant public health threat.
- Accurate strain typing is crucial for infection control and epidemiological studies.
- Traditional typing methods may have limitations in resolving complex MRSA populations.
Purpose of the Study:
- To evaluate the efficacy of immunoblot fingerprinting for MRSA strain typing.
- To identify the predominant MRSA strains circulating in a specific cohort.
- To compare immunoblot typing with established methods like phage typing and antibiograms.
Main Methods:
- 133 MRSA isolates were analyzed using immunoblot fingerprinting.
- Bacterial extracts were prepared via lysostaphin degradation.
- Peptides were separated using SDS-PAGE and transblotted onto nitrocellulose membranes.
- Probing was performed with specific hyperimmune rabbit sera and patient serum.
Main Results:
- Immunoblot typing identified a major epidemic MRSA strain responsible for 102 out of 133 isolates.
- The remaining 31 isolates were classified into seven distinct types.
- These typing results showed good correlation with phage typing and antibiogram data.
Conclusions:
- Immunoblot fingerprinting is a reliable and effective method for MRSA strain characterization.
- The study confirmed the dominance of a specific MRSA epidemic strain.
- This technique aids in epidemiological surveillance and understanding MRSA transmission dynamics.