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Serodiagnosis of Tuberculosis in Asian Elephants (Elephas maximus) in Southern India: A Latent Class Analysis

Verma-Kumar, Shalu and Abraham, David J and Dendukuri, Nandini and Cheeran, Jacob Varghese and Sukumar, Raman and Balaji, Kithiganahalli Narayanaswamy (2012) Serodiagnosis of Tuberculosis in Asian Elephants (Elephas maximus) in Southern India: A Latent Class Analysis. In: PLOS ONE, 7 (11).

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Official URL: http://dx.doi.org/10.1371/journal.pone.0049548


Background: Mycobacterium tuberculosis, a causative agent of chronic tuberculosis disease, is widespread among some animal species too. There is paucity of information on the distribution, prevalence and true disease status of tuberculosis in Asian elephants (Elephas maximus). The aim of this study was to estimate the sensitivity and specificity of serological tests to diagnose M. tuberculosis infection in captive elephants in southern India while simultaneously estimating sero-prevalence. Methodology/Principal Findings: Health assessment of 600 elephants was carried out and their sera screened with a commercially available rapid serum test. Trunk wash culture of select rapid serum test positive animals yielded no animal positive for M. tuberculosis isolation. Under Indian field conditions where the true disease status is unknown, we used a latent class model to estimate the diagnostic characteristics of an existing (rapid serum test) and new (four in-house ELISA) tests. One hundred and seventy nine sera were randomly selected for screening in the five tests. Diagnostic sensitivities of the four ELISAs were 91.3-97.6% (95% Credible Interval (CI): 74.8-99.9) and diagnostic specificity were 89.6-98.5% (95% CI: 79.4-99.9) based on the model we assumed. We estimate that 53.6% (95% CI: 44.6-62.8) of the samples tested were free from infection with M. tuberculosis and 15.9% (97.5% CI: 9.8 - to 24.0) tested positive on all five tests. Conclusions/Significance: Our results provide evidence for high prevalence of asymptomatic M. tuberculosis infection in Asian elephants in a captive Indian setting. Further validation of these tests would be important in formulating area-specific effective surveillance and control measures.

Item Type: Journal Article
Publication: PLOS ONE
Additional Information: Copyright for this article belongs to PUBLIC LIBRARY SCIENCE, USA
Department/Centre: Division of Biological Sciences > Centre for Ecological Sciences
Division of Biological Sciences > Microbiology & Cell Biology
Date Deposited: 22 Jan 2013 06:44
Last Modified: 26 Feb 2019 05:11
URI: http://eprints.iisc.ac.in/id/eprint/45677

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