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Free Content Mycobacterium bovis infection in livestock workers in Ibadan, Nigeria: evidence of occupational exposure

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SETTING: Bovine tuberculosis (TB) is endemic in the cattle population in Nigeria. Livestock workers are at risk of Mycobacterium bovis infection and unaware of their health status.

OBJECTIVE: To determine the occurrence of pulmonary M. bovis infection among livestock workers.

DESIGN: A cross-sectional study of livestock traders was conducted for TB through screening of sputum samples using a simple random sampling method coupled with oral interview on the assumption of sub-clinical pulmonary TB infection. Specimens were cultured, and the isolates analysed using molecular typing techniques.

RESULTS: Overall, 10% (7/70) of the livestock traders had a positive culture indicative of M. tuberculosis complex, which were differentiated into M. bovis (n = 2) and M. tuberculosis (n = 5) using deletion typing. Further spoligotyping analyses of the M. bovis and two available M. tuberculosis isolates classified the strains as SB1432 and SB09444 and LAM_10 CAM and T1 using respectively and spotclust databases. Prolonged cough and >3 years in the livestock trade were risk factors for infection.

CONCLUSION: We confirm that there is undetected pulmonary M. bovis infection among livestock traders in Nigeria. Further studies on the role of occupationally exposed workers in the transmission of M. bovis infection to the larger community are required.

Keywords: Nigeria; transmission; tuberculosis; zoonoses

Document Type: Research Article


Affiliations: 1: Department of Veterinary Public Health and Preventive Medicine, University of Ibadan, Ibadan, Nigeria 2: Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Pretoria, South Africa 3: Department of Pulmonary Diseases and Department of Clinical Microbiology, Nijmegen Medical Centre, Radboud University, Nijmegen, The Netherlands; National Tuberculosis Reference Laboratory, National Institute for Public Health and the Environment, Bilthoven, The Netherlands

Publication date: 2012-10-01

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  • The International Journal of Tuberculosis and Lung Disease publishes articles on all aspects of lung health, including public health-related issues such as training programmes, cost-benefit analysis, legislation, epidemiology, intervention studies and health systems research. The IJTLD is dedicated to the continuing education of physicians and health personnel and the dissemination of information on tuberculosis and lung health world-wide.

    Certain IJTLD articles are selected for translation into French, Spanish, Chinese or Russian. They are available on the Union website

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