Changes in epidemiology of invasive MRSA clones in selected Polish hospitals
Keywords:
Staphylococcus aureus, MRSA, spa type, cloneAbstract
Introduction: Staphylococcus aureus is a pathogen that can cause a wide spectrum of diseases from relatively mild skin infections to life-threatening systemic disease. The study was conducted to assess the clonality of methicillin-resistant isolates of S. aureus (MRSA) in selected Polish hospitals.
Material and Methods: A collection of strains consisted of 183 methicillin-resistant isolates of S. aureus (MRSA) and 4 methicillin susceptible isolates of S. aureus (MSSA) from 2002-2005. Isolates came from 29 hospitals. Purified total DNA of isolates was used to amplify the region X of the gene spa. Subsequently, the amplicons were sequenced and spa types determined.
Results: The analysis of isolates demonstrated the existence of 30 types of spa. The two most common types isolated during the study period were t037 and t052. These types belonged, respectively, to the so-called Brazilian-Hungarian and Iberian clones. During 4 years of observation period, the loss of spa type t052 was observed (from 43% in 2002 to 0% in 2005). In parallel with the disappearance of a spa type t052, a spa t037 percentage increased from 26% in 2002 to 47% in 2005.
Conclusions: The changes in the frequency of occurrence of t052 and t037 isolates show that the Iberian clone, mostly showing susceptibility to cotrimoxazole, was supplanted by the Brazilian/Hungarian clone, mostly showing resistance to cotrimoxazole. The alterations in the structure of the MRSA population in the hospitals selected for the study represent dynamic changes in the epidemiology of clones, most probably related to the selection pressure of antibiotics used in the therapy of hospital infections.
Supporting Agencies
The work was done at the National Institute of Medicines in WarsawDownloads
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