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Antimicrobial Agents and Chemotherapy, April 2002, p. 1147-1152, Vol. 46, No. 4
0066-4804/02/$04.00+0     DOI: 10.1128/AAC.46.4.1147-1152.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Novel Type of Staphylococcal Cassette Chromosome mec Identified in Community-Acquired Methicillin-Resistant Staphylococcus aureus Strains

Xiao Xue Ma,1 Teruyo Ito,1 Chuntima Tiensasitorn,1 Mantana Jamklang,1 Piriyaporn Chongtrakool,1 Susan Boyle-Vavra,2 Robert S. Daum,2 and Keiichi Hiramatsu1*

Department of Bacteriology, Juntendo University, Tokyo, Japan,1 Department of Pediatrics, University of Chicago Children's Hospital, Chicago, Illinois2

Received 25 July 2001/ Returned for modification 10 October 2001/ Accepted 28 November 2001

We identified a new type of staphylococcal cassette chromosome mec (SCCmec) from two community-acquired methicillin-resistant Staphylococcus aureus (MRSA) strains. The novel element, designated type IV SCCmec, had a unique combination of the class B mec gene complex and the type 2 ccr gene complex and was much smaller in size (21 to 24 kb) than previously identified SCCmec elements of hospital-acquired MRSA. Consistent with the strains' susceptibilities to various non-ß-lactam antibiotics, the type IV SCCmec was devoid of any antibiotic resistance genes other than the mecA gene.

* Corresponding author. Mailing address: Department of Bacteriology, Juntendo University, 2-1-1 Hongo, Bunkyo-ku, Tokyo, Japan 113-8421. Phone: 81-3-5802-1040. Fax: 81-3-5684-7830. E-mail: hiram{at}med.juntendo.ac.jp.

Antimicrobial Agents and Chemotherapy, April 2002, p. 1147-1152, Vol. 46, No. 4
0066-4804/02/$04.00+0     DOI: 10.1128/AAC.46.4.1147-1152.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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