Seroprevalence and risk factors for bovine brucellosis in domestic yaks (Bos grunniens) in Tibet, China

文献类型： 外文期刊

第一作者： Zeng, Jiangyong

作者： Zeng, Jiangyong;Cai, Chang;Robertson, Ian;Zeng, Jiangyong;Duoji, Ciren;Yuan, Zhenjie;Yuzhen, Silang;Fan, Weixing;Tian, Lili;Cai, Chang;Robertson, Ian;Robertson, Ian

作者机构：

关键词： Brucellosis; Yak; Prevalence; Risk factors

期刊名称：TROPICAL ANIMAL HEALTH AND PRODUCTION （ 影响因子：1.893； 五年影响因子：1.93 ）

ISSN： 0049-4747

年卷期： 2017 年 49 卷 7 期

页码：

收录情况： SCI

摘要： A cross-sectional study was conducted in three counties (Damxung, Maizhokunggar and Yadong) in Tibet in April and May 2015. A total of 1,523 yaks owned by 181 herders were randomly selected and blood sampled. Sera were tested using the rose bengal test (RBT) and a competitive immune-enzymatic assay (C-ELISA) and the test results interpreted in parallel. The individual yak prevalence was 2.8% (95% CI 2.0-3.7) with a herd prevalence of 18.2% (95% CI 12.9-24.6). At the individual level, two predictor variables, age and production system, were significantly associated with seropositivity by a binary logistic regression analysis. The odds of Brucella infection were significantly higher in older Yaks (3-5 years old, OR = 4.51; 95% CI 1.53-19.29; ae6 years old, OR = 3.89; 95% CI 1.23-17.21) compared to those of younger yaks (ae2 years old). The odds of seropositivity for yaks managed under an agro-pastoral production system were 2.9 (95% CI 1.48-5.86) times higher compared to those managed under a pastoral production system. At the herd level, an association between the infection with Brucella and a history of abortions in the herd was observed (OR = 4.98, 95% CI 1.48-16.62). Surprisingly, vaccination was not associated with a lower level of infection (p = 0.49 and p = 0.99 for individual and herd level data, respectively). The results of the survey indicate that bovine brucellosis is endemic among the yak population in the plateau region of China, and the risk factors identified in the study should be considered in the epidemiology of the disease and when developing control programs for the disease.

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