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Journal of Clinical Microbiology, March 2006, p. 1081-1083, Vol. 44, No. 3
0095-1137/06/$08.00+0 doi:10.1128/JCM.44.3.1081-1083.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Insertion Sequence IS900 Revisited
Makeda Semret,
Christine Y. Turenne, and
Marcel A. Behr*
McGill University Health Center, Montreal, Quebec, Canada
Received 22 November 2005/
Returned for modification 28 December 2005/
Accepted 1 January 2006
Many studies investigating Mycobacterium avium subsp. paratuberculosis in Crohn's disease have used molecular detection of IS900 in clinical samples, but some have described polymorphisms in IS900 as variants of this organism. Analysis of 23 M. avium subsp. paratuberculosis isolates revealed that IS900 is highly conserved, with only two sequevars distinguishing sheep and cattle lineages. Amplification of IS900-like sequences is not sufficient as a proxy for M. avium subsp. paratuberculosis.
* Corresponding author. Mailing address: Division of Infectious Diseases and Medical Microbiology, A5-156, Montreal General Hospital, 1650 Cedar Avenue, Montreal, QC H3G 1A4, Canada. Phone: (514) 934-1934, ext. 42815. Fax: (514) 934-8423. E-mail:
marcel.behr{at}mcgill.ca.
Journal of Clinical Microbiology, March 2006, p. 1081-1083, Vol. 44, No. 3
0095-1137/06/$08.00+0 doi:10.1128/JCM.44.3.1081-1083.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
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