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首页> 外文期刊>Frontiers in Microbiology >Advances and Perspectives on the Epidemiology of Bovine Cryptosporidium in China in the Past 30 Years
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Advances and Perspectives on the Epidemiology of Bovine Cryptosporidium in China in the Past 30 Years

机译：近30年来中国牛隐孢子虫病流行病学研究进展与展望

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Major progress has been made in understanding the epidemiology of bovine Cryptosporidium in China in the past 30 years. The overall infection rate in that period was 14.50% (5265/36316), with different prevalence being observed among dairy cattle, yaks, beef cattle, and buffalo. The infection rate declined as the animals’ ages increased and the lowest prevalence occurred in winter. Ten Cryptosporidium species and two genotypes have been found in cattle, with Cryptosporidium parvum , C. andersoni , C. bovis , and C. ryanae being the commonest species. Cryptosporidium bovis rather than C. parvum predominated in preweaned dairy cattle, and C. parvum IIdA15G1 and IIdA19G1 were the only subtypes detected in dairy cattle. Two subtype families, IIa and IId, were found in yaks. Population genetic analysis detected an epidemic population structure in C. andersoni , which suggested that the prevalence of C. andersoni in China is not attributable to the introduction of dairy cattle. Moreover, C. parvum IId subtypes probably dispersed from western Asia to other geographic regions based on population genetic analysis of isolates from China, Sweden, and Egypt. Therefore, we hypothesize that Cryptosporidium was introduced into China in the past, and different populations formed progressively in various hosts in response to diverse factors, including the transmission dynamics, geographic isolation, host specificity, and large-scale farming. More epidemiological studies are required to test this hypothesis and to clarify the prevalence and transmission of Cryptosporidium species in China.
机译：在过去的30年中，在了解中国牛隐孢子虫的流行病学方面取得了重大进展。在此期间，总感染率是14.50％（5265/36316），在奶牛，牛，肉牛和水牛中观察到不同的患病率。随着动物年龄的增长，感染率下降，冬季的患病率最低。在牛中发现了十种隐孢子虫物种和两种基因型，其中小隐隐孢子虫，C。andersoni，C。bovis和C. ryanae是最常见的物种。在断奶前的奶牛中，牛隐孢子虫而不是小隐孢子虫占主导地位，而小隐隐孢子虫IIdA15G1和IIdA19G1是在奶牛中检测到的唯一亚型。在牛中发现了两个亚型家族IIa和IId。人口遗传分析发现了安德森梭菌的流行种群结构，这表明安德森梭菌在中国的流行并不归因于奶牛的引进。此外，基于对来自中国，瑞典和埃及的分离株的遗传分析，细小隐孢子虫IId亚型可能从西亚分散到其他地理区域。因此，我们假设隐孢子虫是在过去引入中国的，不同种群在不同宿主之间逐渐形成，以应对多种因素，包括传播动力学，地理隔离，宿主特异性和大规模耕种。需要更多的流行病学研究来检验这一假说并阐明中国隐孢子虫的流行和传播。

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