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Prevalence of Brucellosis in Changra Goats of Cold Arid Desert, Ladakh, Jammu and Kashmir

Abha Mariam Masood S. Mir Vivek Gupta Zahid A. Kashoo Mudasir A. Rather Omer Khalil Baba Asif H Sofi Hilal M. Khan
Vol 7(12), 124-142
DOI- http://dx.doi.org/10.5455/ijlr.20170129062556

Prevalence of brucellosis was studied in unvaccinated Changra goats in their native breeding tract of Changthang in the Indian Trans-Himalayan area of Ladakh which represents the western extension of the Tibetan Plateau, an important highland grazing ecosystem. A total of 680 serum samples were collected from 8 different areas including Kharnak, Sumdho, Chushul, Mughlib and Kargyam in the traditional Changra rearing belt, and Digger, Turtuk and Stakna in non-traditional belt. Brucellosis was diagnosed using serological tests viz RBPT, STAT, Dot-ELISA and Plate-ELISA, and serum based PCR. Apparent prevalence was calculated and true prevalence worked out on the basis of sensitivity and specificity for each test. The flock-level prevalence of brucellosis was 80% to 100%. The overall apparent prevalence by RBPT, STAT, Dot-ELISA, Plate ELISA and serum PCR, respectively was 24.85 (95% CI 21.65-28.28), 13.97 (95% CI 11.49-16.80), 26.03 (95% CI 22.83-29.46), 12.21 (95% CI 9.87-14.88) and 14.71 (95% CI 12.15-17.54) and true prevalence worked out on the basis of sensitivity and specificity for each test was 29.45 (95% CI 25.49-33.68), 23.16 (95% CI 18.73-28.21), 18.38 (95% CI 13.05-24.10), 17.19 (95% CI 13.90-20.96) and 15.16 (95% CI 12.53-18.08). The respective overall apparent and true prevalences were higher in traditional areas than in non-traditional areas.Prevalence was significantly (P≤0.05) higher in adult goats (>1 year) when compared with young (<1year). The present study revealed that brucellosis is prevalent in Ladakh region among changra goats and hence provides a source of zoonotic risk to the people rearing them because of intimate human-animal association.

Keywords : Changra Goats Brucellosis RBPT ELISA PCR

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