Abstract
BackgroundChlamydia is gram-negative obligate bacteria which causes a wide variety of diseases in humans and animals. To date, there are a few reports about the seroprevalence of Chlamydia and the risk factors associated with Chlamydia infection in yaks in the world. In this study, 974 blood samples were collected from white yaks (Bos grunniens) in Tianzhu Tibetan Autonomous County, Gansu province, northwest China from June 2013 to April 2014.ResultsAntibodies against Chlamydia abortus were examined by the indirect hemagglutination (IHA) test, and 158 of 974 (16.22%) white yaks were seropositive for C. abortus antibodies at the cut-off of 1:16. The risk factors associated with seroprevalence were evaluated by a multivariate logistic regression analysis. Region, gender and age of white yak were left out of the final model, due to its insignificance in the logistic regression analysis (P > 0.05). However, season was considered as a major risk factor associated with C. abortus infection in white yaks.ConclusionsTo our knowledge, this is the first survey of C. abortus seroprevalence in white yaks in China, which extends the host range for C. abortus and has important implications for public health and the local Tibetan economy.
Highlights
Chlamydia is gram-negative obligate bacteria which causes a wide variety of diseases in humans and animals
The free-range white yaks feed on local weeds and brook, which only live in Tianzhu Tibetan Autonomous County in China
In this study, serum samples were collected from a total of 974 white yaks (73 from Zhuaxixiulong village and 901 from Xidatan village) in Tianzhu Tibetan Autonomous County, Gansu province, northwest China. 158 out of 974 serum samples (16.22%) were seropositive for C. abortus by indirect hemagglutination (IHA) test at the cutoff dilution of 1:16 (Table 1)
Summary
Chlamydia is gram-negative obligate bacteria which causes a wide variety of diseases in humans and animals. 974 blood samples were collected from white yaks (Bos grunniens) in Tianzhu Tibetan Autonomous County, Gansu province, northwest China from June 2013 to April 2014. Chlamydia spp. are obligate intracellular bacteria which are the etiological agents of chlamydiosis and cause a broad spectrum of diseases in animals and humans [1,2]. White yak is a semi-natural and rare breed of cattle in the world which only lives in Tianzhu Tibetan Autonomous County, Gansu province, northwest China with a condition of alpine hypoxia and low temperature [18]. The objective of the present survey was to investigate the seroprevalence and risk factors including region, gender, age and season of C. abortus infection in white yaks
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