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Journal of Clinical Microbiology, July 2006, p. 2492-2498, Vol. 44, No. 7
0095-1137/06/$08.00+0 doi:10.1128/JCM.01428-05
Copyright © 2006, American Society for Microbiology. All Rights Reserved.
Health Protection Agency Mycobacterium Reference Unit, Clinical Research Centre, Barts and the London Medical School, Queen Mary College, University of London, 2 Newark Street, London E1 2AT, United Kingdom
Received 14 July 2005/ Returned for modification 13 February 2006/ Accepted 14 May 2006
While high-copy-number IS6110-based restriction fragment length polymorphism (HCN-RFLP) is the gold standard for typing most Mycobacterium tuberculosis strains, the time taken for culturing and low throughput make it impractical for large-scale prospective typing of large numbers of isolates. The development of a new method, mycobacterial interspersed repetitive units (MIRU), a variation of the original variable-number tandem repeat (VNTR) technique, may provide a viable alternative. Panels based on the original 12-loci MIRU (12MIRU), a combination of 12MIRU and remaining ETR loci (15MIRU-VNTR), and an extended panel with an additional 10 novel regions (25VNTR) were used to study three populations with varying degrees of epidemiological data. MIRU discrimination increased with panel size and the addition of spoligotyping. Combining these two techniques enabled a reduction in the panel size from 25 to 14 loci without a significant loss in discrimination. However, 25VNTR alone or in combination with spoligotyping still possessed weaker discrimination than RFLP for high-copy-number isolates.
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