Genetic characteristics and geographic segregation of Giardia duodenalis in dairy cattle from Guangdong Province, southern China
文献类型： 外文期刊
作者： Cai, Zhaohui 1 ; Wang, Luyang 1 ; Cao, Letian 1 ; Sun, Mingfei 4 ; Liang, Nan 3 ; Wang, Haiyan 1 ; Chang, Yankai 1 ; Lin, 1 ;
作者机构： 1.Henan Agr Univ, Coll Anim Sci & Vet Med, 15 Longzihu Univ Area, Zhengzhou 450002, Henan, Peoples R China
2.Int Joint Res Lab Zoonot Dis Henan, Zhengzhou, Henan, Peoples R China
3.Henan Vocat Coll Agr, Coll Anim Husb Engn, Zhongmu 451450, Henan, Peoples R China
4.Guangdong Acad Agr Sci, Inst Anim Hlth, Guangzhou 510640, Guangdong, Peoples R China
关键词： Giardia duodenalis; Prevalence; Multilocus sequence typing; Geographical segregation
期刊名称：INFECTION GENETICS AND EVOLUTION （ 影响因子：3.342； 五年影响因子：3.188 ）
ISSN： 1567-1348
年卷期： 2018 年 66 卷
页码：
收录情况： SCI
摘要： Giardia duodenalis is a gastrointestinal parasitic protozoan with important00 veterinary and public health implications worldwide. In this study, a total of 1440 fecal specimens were collected from dairy calves in Guangdong Province, China. The overall prevalence of G. duodenalis was 2.2% (31/1440) by polymerase chain reaction (PCR). The prevalence was 8.4% and 1.1% in pre- and post-weaned calves, respectively. Both assemblages A (6.5%, 2/31) and E (93.5%, 29/31) were found based on sequence analysis of the SSU rRNA gene. All G. duodenalis-positive samples were assayed with PCR followed by sequencing the beta giardin (bg), glutamate dehydrogenase (gdh), and triosephosphate isomerase (tpi) genes, and 20, 23, and 18 sequences were obtained, respectively. Multilocus genotyping yielded 10 assemblage E multilocus genotypes (MLGs). All assemblage E MLGs were genetically distinct from those obtained in cattle from Henan, Xinjiang, Shanghai, and Shaanxi in China. This finding was also supported by F-ST, N-m, and median-joining network analysis. Results of this study indicated that G. duodenalis was found in low prevalence in dairy calves in Guangdong Province, southern China; nevertheless, the infected calves might represent a public health risk in this region. Additionally, the differences in assemblage E MLGs from the five analyzed regions revealed significant geographic segregation of G. duodenails in China.
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