Repeated cross-sectional skin testing for bovine tuberculosis in cattle kept in a traditional husbandry system in Ethiopia

Tschopp, R.; Schelling, E.; Hattendorf, J.; Young, D.; Aseffa, A.; Zinsstag, J.
August 2010
Veterinary Record: Journal of the British Veterinary Association;8/14/2010, Vol. 167 Issue 7, p250
Academic Journal
Representative repeated cross-sectional skin testing for bovine tuberculosis (TB) was conducted over a period of three years in a total of 5377 cattle in three randomly selected woredas (districts) in Ethiopia (Meskan, Woldia and Bako-Gazer) that had never previously been tested for TB. Almost all (99 per cent) of the animals included local zebus kept in traditional husbandry systems. The comparative intradermal tuberculin test with two diagnostic thresholds were used to define positive test results, one according to the World Organisation for Animal Health (OIE) recommended cut-off of more than 4 mm, and the other with a cut-off of >2 mm. Data analysis was performed using a logistic regression model with a random effect at the village level. Applying the OIE definition, the overall representative apparent prevalence of bovine TB in skin test-positive local zebus was 0.9 per cent (95 per cent confidence interval [CI] 0.6 to 1.3 per cent). Using a cut-off of more than 2 mm the overall representative prevalence increased to 4 per cent (95 per cent CI 2.4 to 4.8 per cent). Due to the low apparent prevalence, the true prevalence could be calculated only in Meskan (4.5 per cent) and Bako-Gazer (2.4 per cent) for the more than 2 mm cutoff. With the exception of Meskan, prevalence by woreda did not change significantly over the years. Mycobacterium avium reactor animals were found at all study sites, but there were significant geographical variations. Overall, bulls and oxen were more at risk of being positive reactors (odds ratio [OR] 1.6, 95 per cent CI 1.1 to 2.3; OR 2, 95 per cent CI 1.4 to 2.6, respectively), as were animals in good body condition (OR 2, 95 per cent CI 1.5 to 2.9). Similar results were found at woreda level with the exception of Woldia, where none of the analysed variables was significantly associated with a positive test result.


Related Articles

  • The interferon-gamma field trial: background, principles and progress. Vordermeier, M.; Goodchild, A.; Clifton-Hadley, R.; de la Rua, R. // Veterinary Record: Journal of the British Veterinary Association;7/10/2004, Vol. 155 Issue 2, p37 

    Since November 2002, the State Veterinary Service and the Veterinary Laboratories Agency have been conducting a field trial to assess the interferon-gamma test as an ancillary parallel test to the tuberculin skin test in herds with confirmed tuberculosis breakdowns. Here, Martin Vordermeier,...

  • A policy for bovine TB.  // Veterinary Record: Journal of the British Veterinary Association;4/3/2004, Vol. 154 Issue 14, p419 

    Details the British Veterinary Association Veterinary Policy Group's policy paper for dealing with bovine tuberculosis. Concern on the increasing number of affected herds; Need for imposing the proposals for banning the movement of cattle from high- to low-risk areas.

  • Bovine tuberculosis: how likely is a skin test reactor to be uninfected? Drewe, J. A. // Veterinary Record: Journal of the British Veterinary Association;9/12/2015, Vol. 177 Issue 10, p256 

    The author comments on an article published in this issue of the journal which proposed a method for estimating the specificity of a comparative skin test for bovine tuberculosis (TB) in Great Britain. Particular focus is given to problems associated with diagnosing TB in cattle. Topics...

  • BCVA calls for a new kind of partnership to tackle bovine TB.  // Veterinary Record: Journal of the British Veterinary Association;5/4/2013, Vol. 172 Issue 18, p461 

    The article reports on the issues addressed by the British Cattle Veterinary Association (BCVA) about the management of bovine tuberculosis (TB) in Great Britain. BCVA calls for a partnership between the government, the veterinary profession and the cattle industry. According to the BCVA, the...

  • Bovine TB: DEFRA reports a fall in herd breakdowns.  // Veterinary Record: Journal of the British Veterinary Association;6/19/2004, Vol. 154 Issue 25, p770 

    Reports that Great Britain's Department of Environment and Rural Affairs has released provisional statistics for the first four months of 2004 indicating a reduction in the number of herds under restrictions relating to bovine tuberculosis and a decrease in the number of herd incidents, compared...

  • Thinking again on bovine TB.  // Veterinary Record: Journal of the British Veterinary Association;2/21/2004, Vol. 154 Issue 8, p217 

    Comments on the British government's consultation document on preparing a new strategy on bovine tuberculosis (TB). Informative overview of knowledge on bovine TB and ways of controlling it; Extent of the rise and spread of the disease; Timetable for the eradication of the disease.

  • Transmission of bovine TB. Howie, Neil M. // Veterinary Record: Journal of the British Veterinary Association;7/12/2014, Vol. 175 Issue 2, p52 

    A letter to the editor is presented in response to a letter from Marc Abraham and others on transmission of bovine tuberculosis, published in the June 28, 2014 issue of the journal.

  • Untitled. Blowey, Roger; Gray, Carl; Griffiths, James; Rowe, Jan // Veterinary Record: Journal of the British Veterinary Association;3/7/2015, Vol. 176 Issue 10, p260 

    A response from the author of the article regarding bovine tuberculosis (TB) in the February 21, 2015 issue is presented.

  • Bovine TB: Wales tightens policy on inconclusive reactors.  // Veterinary Record: Journal of the British Veterinary Association;12/6/2008, Vol. 163 Issue 23, p670 

    The article focuses on the revised policy in Wales concerning cattle that do not react conclusively to the bovine tuberculosis (TB) skin test. Elin Jones, Welsh Rural Affairs Minister, has announced on December 1, 2008 that starting on March 1, 2009 cattle which are inconclusively reactor will...


Read the Article


Sign out of this library

Other Topics