Population structure of Mycobacterium bovis isolates from cattle in Mexico.

Autor: Gutiérrez Reyes JA; Dirección General de Salud Animal-SENASICA-SAGARPA, Mexico., García Casanova L, Romero Torres C, Sosa Gallegos SL, Cantó Alarcón GJ, Mercado Pezzat M, Pizano Martínez O, Estrada Chávez C, Milián Suazo F
Jazyk: angličtina
Zdroj: Preventive veterinary medicine [Prev Vet Med] 2012 Sep 01; Vol. 106 (1), pp. 1-8. Date of Electronic Publication: 2012 Jun 15.
DOI: 10.1016/j.prevetmed.2012.05.008
Abstrakt: The molecular fingerprints of 878 isolates of Mycobacterium bovis collected from cattle between 2009 and 2010 in different regions of Mexico were used in this study. One hundred and ninety-four spoligotypes were observed in total with a high degree of heterogeneity. Sixty-four percent of the isolates grouped into just nine spoligotypes, and 27% fell into only two spoligotypes: SB0673 and SB0669; 149 were orphan spoligotypes. The two predominant spoligotypes were found in almost all states in Mexico, especially in central Mexico, where there is a high concentration of dairy cattle; however, some spoligotypes were closely associated with restricted geographical areas. The hypothetical evolutionary relationship among spoligotypes was estimated using the spoligoforest program in the spolTools webpage. Four trees with connected components and nine unconnected nodes were found. The biggest tree had SB0140 strain as a root, suggesting this as the oldest strain in the tree. However, the relationship of this spoligotype with SB0673 and SB0669 was weak. The discriminatory power of spoligotyping for this M. bovis sample of isolates was 0.94, and the recent transmission index (RTI) 0.83, suggesting a high rate of recent transmission of some strains of M. bovis in the population. This parameter indicates that new measures are required to stop the dissemination of tuberculosis in cattle.
(Copyright © 2012 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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