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  • Title: Epidemiologic genotyping of methicillin-resistant Staphylococcus aureus by pulsed-field gel electrophoresis at a university hospital and comparison with antibiotyping and protein A and coagulase gene polymorphisms.
    Author: Montesinos I, Salido E, Delgado T, Cuervo M, Sierra A.
    Journal: J Clin Microbiol; 2002 Jun; 40(6):2119-25. PubMed ID: 12037075.
    Abstract:
    A total of 124 methicillin-resistant Staphylococcus aureus (MRSA) isolates were ascertained at the University Hospital of the Canary Islands between January 1997 and April 2000. Genotyping included pulsed-field gel electrophoresis (PFGE) (SmaI digestion) and PCR-restriction fragment length polymorphism (PCR-RFLP) analysis for the coagulase (coa) and protein A (spa) genes. Antibiotic resistance was the main phenotypic marker correlated with genotyping results. Three main PFGE types were detected: A (with 12 subtypes), B (with 2 subtypes), and C. PFGE type A1 was the most commonly found (61% of isolates) and the one responsible for all the epidemic outbreaks. Other genetics markers used (coa and spa RFLPs) were significantly correlated with the PFGE types detected (P < 0.001). These PCR-RFLP assays were useful as molecular markers for a quick, preliminary study of MRSA outbreaks.
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