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Journal of Clinical Microbiology, October 1999, p. 3217-3222, Vol. 37, No. 10
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Study of Restriction Fragment Length Polymorphism Analysis and Spoligotyping for Epidemiological Investigation of Mycobacterium bovis Infection

Eamon Costello,1,* Donnacha O'Grady,1 Orla Flynn,1 Rory O'Brien,2 Mark Rogers,2 Frances Quigley,1 John Egan,1 and John Griffin3

Central Veterinary Research Laboratory, Abbotstown, Castleknock, Dublin 15,1 and National Agricultural and Veterinary Biotechnology Centre2 and Veterinary Epidemiology and Tuberculosis Investigation Unit,3 University College Dublin, Dublin 4, Ireland

Received 7 December 1998/Returned for modification 2 April 1999/Accepted 7 April 1999

Restriction fragment length polymorphism (RFLP) analysis with probes derived from the insertion element IS6110, the direct repeat sequence, and the polymorphic GC-rich sequence (PGRS) and a PCR-based typing method called spacer oligonucleotide typing (spoligotyping) were used to strain type Mycobacterium bovis isolates from the Republic of Ireland. Results were assessed for 452 isolates which were obtained from 233 cattle, 173 badgers, 33 deer, 7 pigs, 5 sheep, and 1 goat. Eighty-five strains were identified by RFLP analysis, and 20 strains were identified by spoligotyping. Twenty percent of the isolates were the most prevalent RFLP type, while 52% of the isolates were the most prevalent spoligotype. Both the prevalent RFLP type and the prevalent spoligotype were identified in isolates from all animal species tested and had a wide geographic distribution. Isolates of some RFLP types and some spoligotypes were clustered in regions consisting of groups of adjoining counties. The PGRS probe gave better differentiation of strains than the IS6110 or DR probes. The majority of isolates from all species carried a single IS6110 copy. In four RFLP types IS6110 polymorphism was associated with deletion of fragments equivalent in size to one or two direct variable repeat sequences. The same range and geographic distribution of strains were found for the majority of isolates from cattle, badgers, and deer. This suggests that transmission of infection between these species is a factor in the epidemiology of M. bovis infection in Ireland.


* Corresponding author. Mailing address: Eamon Costello, Central Veterinary Research Laboratory, Abbotstown, Castleknock, Dublin 15, Ireland. Phone: (353) 1 6072789. Fax: (353) 1 8213010. E-mail: eamoncos{at}indigo.ie.


Journal of Clinical Microbiology, October 1999, p. 3217-3222, Vol. 37, No. 10
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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