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Journal of Clinical Microbiology, July 2006, p. 2442-2448, Vol. 44, No. 7
0095-1137/06/$08.00+0 doi:10.1128/JCM.00113-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Classifying spa Types in Complexes Improves Interpretation of Typing Results for Methicillin-Resistant Staphylococcus aureus
Werner Ruppitsch,*
Alexander Indra,
Anna Stöger,
Barbara Mayer,
Silke Stadlbauer,
Günther Wewalka, and
Franz Allerberger
Austrian Agency for Health and Food Safety, Institute of Medical Microbiology and Hygiene, Spargelfeldstrasse 191, 1226 Vienna, Austria
Received 18 January 2006/
Returned for modification 23 February 2006/
Accepted 6 May 2006
A total of 382 isolates of methicillin-resistant Staphylococcus aureus originating from three Austrian regions and one adjacent Italian region (Vienna, Lower Austria, North Tyrol, and South Tyrol) were typed by DNA sequence analysis of the variable repeat region of the protein A gene (spa typing). The strain collection consisted of arbitrarily chosen isolates originating from clinical specimens taken in the years 2003 to 2005 at 17 hospitals. The most common spa types found were t001 (28.8% of all isolates), t190 (27.0%), t008 (14.1%), and t041 (11.3%). The 42 remaining spa types accounted for
2.4% each. The dominating spa types varied between the different regions. As short sequence DNA repeat units are unstable entities, the 46 spa types were classified into seven spa complexes with respect to short sequence repeat unit composition and organization. Such classification into complexes can provide additional information for the hospital epidemiologist, empowering one to differentiate the introduction of a new strain from mere variation of endemic spa types.
* Corresponding author. Mailing address: Austrian Agency for Health and Food Safety, Institute of Medical Microbiology and Hygiene, Spargelfeldstrasse 191, A-1226 Vienna, Austria. Phone: 0043 50 555 32204. Fax: 0043 50 555 32219. E-mail: werner.ruppitsch{at}ages.at.
Journal of Clinical Microbiology, July 2006, p. 2442-2448, Vol. 44, No. 7
0095-1137/06/$08.00+0 doi:10.1128/JCM.00113-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
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Copyright © 2006 by the American Society for Microbiology. All rights reserved.