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Free Content Analysis of multidrug-resistant Mycobacterium bovis from three clinical samples from Scotland

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OBJECTIVE: To determine whether multidrug-resistant (MDR) strains of Mycobacterium bovis isolated from patients in Scotland were genotypically related.

DESIGN: Genotypes of MDR strains were determined using three molecular fingerprinting techniques: pulsed-field gel electrophoresis (PFGE), spoligotyping and re-striction fragment length polymorphism (RFLP). PFGE profiles were also obtained for all medical and veterinary isolates occurring in Scotland in 1997–1998.

RESULTS: MDR strains showed individual Dra I PFGE profiles. Case III/98 had a profile represented in both veterinary and medical populations, Case I/94 had a profile observed in medical but not veterinary isolates, and Case II/98 had a profile unique to this study. Afl II PFGE discriminated the resistant strains. Spoligotyping grouped Cases I/94 and II/98 (ST-134). Case III/98 had a spoligotype ST-140, which is commonly observed in veterinary isolates. Similarly, DRr-RFLP analysis grouped cases I/94 and II/98, whereas Case III/98 had a common veterinary profile. DRX(PGRS) RFLP gave three unique profiles.

CONCLUSION: Three resistant strains were discriminated by PFGE and DRX(PGRS) RFLP, indicating that the three strains are not related in an epidemiologically relevant time scale. However, Cases I/94 and II/98 were more closely linked by spoligotyping and DRr-RFLP data. PFGE and DRr-RFLP linked Case III/98 profiles to the most common veterinary isolate.

Keywords: Mycobacterium bovis; multidrug resistance; pulsed-field gel electrophoresis; restriction fragment length polymorphism; spoligotyping

Document Type: Regular Paper

Affiliations: 1: Moredun Research Institute, Bacteriology, Penicuik, Scotland, United Kingdom 2: Department of Agriculture and Rural Development, Veterinary Sciences Division, Belfast, Northern Ireland 3: City Hospital, Scottish Mycobacterial Reference Laboratory, Edinburgh, Scotland, United Kingdom

Publication date: 2003-12-01

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

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