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Progress in the control of bovine tuberculosis in Spanish wildlife

AuthorsGortázar, Christian ; Vicente, Joaquín ; Boadella, Mariana ; Ballesteros, Cristina ; Galindo, Ruth C. ; Garrido, Joseba M.; Aranaz, Alicia; Fuente, José de la
KeywordsWildlife epidemiology
Sus scrofa
Meles meles
Disease control
Cervus elaphus
Issue Date2011
CitationVeterinary Microbiology 151(1-2): 170-178 (2011)
AbstractDespite the compulsory test and slaughter campaigns in cattle, bovine tuberculosis (bTB) is still present in Spain, and the role of wildlife reservoirs is increasingly recognized. We provide an update on recent progress made in bTB control in Spanish wildlife, including aspects of epidemiology, surveillance, host-pathogen interaction and wildlife vaccination.At the high densities and in the particular circumstances of Mediterranean environments, wild ungulates, mainly Eurasian wild boar and red deer, are able to maintain Mycobacterium bovis circulation even in absence of domestic livestock. Infection is widespread among wild ungulates in the south of the country, local infection prevalence being as high as 52% in wild boar and 27% in red deer. Risk factors identified include host genetic susceptibility, abundance, spatial aggregation at feeders and waterholes, scavenging, and social behaviour. An increasing trend of bTB compatible lesions was reported among wild boar and red deer inspected between 1992 and 2004 in Southwestern Spain. Sporadic cases of badger TB have been detected, further complicating the picture.Gene expression profiles were characterized in European wild boar and Iberian red deer naturally infected with M. bovis. The comparative analysis of gene expression profiles in wildlife hosts in response to infection advanced our understanding of the molecular mechanisms of infection and pathogenesis, revealed common and distinctive host responses to infection and identified candidate genes associated with resistance to bTB and for the characterization of host response to infection and vaccination.Ongoing research is producing valuable knowledge on vaccine delivery, safety and efficacy issues. Baits for the oral delivery of BCG vaccine preparations to wild boar piglets were developed and evaluated. The use of selective feeders during the summer was found to be a potentially reliable bait-deployment strategy. Safety experiments yielded no isolation of M. bovis BCG from faeces, internal organs at necropsy and the environment, even after oral delivery of very high doses. Finally, preliminary vaccination and challenge experiments suggested that a single oral BCG vaccination may protect wild boar from infection by a virulent M. bovis field strain.
DescriptionSpecial issue: 5th International Conference on Mycobacterium bovis.-- HAL Id: hal-00701898
Publisher version (URL)http://dx.doi.org/10.1016/j.vetmic.2011.02.041
Identifiersdoi: 10.1016/j.vetmic.2011.02.041
issn: 0378-1135
e-issn: 1873-2542
Appears in Collections:(IREC) Artículos
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