Mycobacterium bovis infection in livestock workers in Ibadan, Nigeria: evidence of occupational exposure
Abstract: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 www.mbovis.org 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.
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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