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Asian Journal of Animal and Veterinary Advances
Year: 2014  |  Volume: 9  |  Issue: 6  |  Page No.: 323 - 344

Insights into Bovine Tuberculosis (bTB), Various Approaches for its Diagnosis, Control and its Public Health Concerns: An Update

Amit Kumar Verma, Ruchi Tiwari, Sandip Chakraborty, Neha, Mani Saminathan, Kuldeep Dhama and Shoor Vir Singh    

Abstract: Bovine tuberculosis (bTB) is a zoonotic disease transmitted from animals to human and makes significant economic impacts due to high cost of eradication programs, trade restriction and serious consequences regarding public health thereby causing human tuberculosis. Mycobacterium bovis is the main etiological agent of bTB which is an acid fast staining bacterium due to waxy substance (mycolic acid) present in its bacterial cell wall. The bacteria can be transmitted by both aerogenous and enterogenous routes. Disease causes development of miliary tubercular lesions, chronic cough, obstructions of air passages and alimentary tract or blood vessels and enlargement of lymph nodes. A spectrum of Cell-Mediated Immune responses (CMI) predominate infection, projecting the role of macrophages and T-cell populations. In advanced stage, there is increased humoral response. Polymerase Chain Reaction (PCR) and real time quantitative PCR (RT-qPCR) have been widely used for the detection of M. tuberculosis complex in clinical samples. Single intradermal test, short thermal test and Stormont tests are the valuable delayed type of hypersensitivity tests. Gamma interferon assay, lymphocyte proliferation assay, Enzyme Linked Immune Sorbent Assay (ELISA), multiantigen print immunoassay (MAPIA), Fluorescent Polarization Assay (FPA), immunochromatographic lateral flow test, single antigen as well as multiplex chemiluminescence assays are the various blood-based laboratory tests. Attenuated bovine-strain of tuberculosis bacterium, known as Bacillus of Calmette and Guerin (BCG) is used as vaccine. The present review addresses important insights into the bovine TB, a complex and multi-species disease, the etiological agent, advances and trends in its diagnosis, vaccine development and treatment options and the public health significance of this important disease which would altogether help devising effective strategies for prevention and control of tuberculosis in cattle as well as in wildlife.

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