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Investigation of risk factors and dynamics of bovine tuberculosis: A cohort study in south west En

Investigation of risk factors and dynamics of bovine tuberculosis: A cohort study in south west England.

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Investigation of risk factors and dynamics of bovine tuberculosis: A cohort study in south west En

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  1. Investigation of risk factors and dynamics of bovine tuberculosis: A cohort study in south west England A. Ramirez-Villaescusa, L.E. Green, G.F. MedleyEcology and Epidemiology Group, Dept. Biological Sciences, The University of Warwick, Coventry, CV4 7AL, UK E-Mail: a.m.ramirez@warwick.ac.uk • Objectives • Use the FMD 2001 outbreak as a natural experiment to • Quantify cow to cow transmission of bovine TB within and between herds in non restocked and restocked herds • Identify other risk factors associated with the occurrence of herd breakdown with bovine tuberculosis Materials and Methods Farm Selection and Study Setup Data sources Data obtained • 151 farms recruited from 368 randomly selected farms • Recruitment period: November 2002 - October 2003 • Farmers contacted by post, local meetings, telephone • Location of farms: counties of Gloucester, Worcester, Hereford, • Somerset, Devon and Cornwall • Herd size: from 3 to more than 500 cattle • Type of Herd: dairy, suckler, beef, mixed • Matching criteria and farm grouping: • 3 non-restocked (non exposed) to 1 restocked (exposed) farm • between farm distance: >4Km • same treatment group as for randomised badger culling trial • 29 groups formed • Farmer interview, building survey and veterinary questionnaire • 10,000 blood samples from bulls and cows > 2 years old British Cattle Movement Scheme (BCMS) Animal Movement Records TB Test Results VLA, Defra Management Farm Practices Nutrition Farmer Questionnaire Disease Records Veterinary Surgeon Questionnaire Buildings, yards, feed stores Building Survey Future analysis BVD, IBR, Leptospirosis, Neospora, Johne’s Disease Blood samples Study Period and Progress Field data collection - an example from one farm September 2002 Bloods: 10,000 samples collected 1st year 1st Year Farmer (complete) September 2003 Bloods: 1,500 samples collected to date Building survey in progress 2nd year Veterinary Questionnaire September 2004 2nd Year Farmer Questionnaire Blood samples 3rd year Final results September 2005 Future work Data collected will be assimilated to establish the between and within farm contact structure of cattle The importance of cattle to cattle transmission of bovine tuberculosis and other diseases Acknowledgements All the participating farmers, the TB Project team: Fiona Boyd, Fiona Campbell, Juanjo Carrique-Mas, Patricia Findlay, Rod Fleming, Sian Mercer, Alex Puddephatt, Nola Shearsby, Anna Thomas DEFRA for funding

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