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首页> 外文期刊>Tropical Animal Health and Production >The diversity of BVDV subgenotypes in a vaccinated dairy cattle herd in Brazil.
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The diversity of BVDV subgenotypes in a vaccinated dairy cattle herd in Brazil.

机译：在巴西接种疫苗的奶牛群中，BVDV亚型的多样性。

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摘要

Bovine viral diarrhoea virus (BVDV) is an important pathogen of cattle that occurs worldwide with substantial economic impact on beef and dairy industries. The aim of this study was to describe the diversity of BVDV subgenotypes in persistently infected (PI) animals identified in a highly productive, regularly vaccinated, dairy cattle herd presenting with reproductive failure. Serum samples were collected from all animals within the herd (n=692) and used to detect the presence of BVDV RNA. Using reverse transcription polymerase chain reaction assay, 29 cows were identified as transiently infected, three animals (two cows and one calf) as persistently infected, and one calf as putative BVDV PI animal. The sequences of 5'UTR and/or Npro gene of BVDV used in phylogenetic analyses revealed that the three PI animals were infected by three different BVDV subgenotypes (BVDV-1a, BVDV-1b, and BVDV-1d). These results demonstrated that in an open dairy cattle herd, regular vaccination against BVDV by itself is not able to prevent viral circulation in the herd. Furthermore, depending on the frequency of the acquisition of heifers and/or cows for replacement, several BVDV subgenotypes may co-exist simultaneously in the same herd.
机译：牛病毒性腹泻病毒（BVDV）是一种重要的牛病原体，在世界范围内广泛传播，对牛肉和奶制品行业产生重大经济影响。这项研究的目的是描述在高生产率，定期接种疫苗的奶牛群中出现繁殖失败的持续感染（PI）动物中BVDV亚型的多样性。从牛群中的所有动物中收集血清样本（n = 692），并用于检测BVDV RNA的存在。使用逆转录聚合酶链反应测定法，鉴定出29头牛被暂时感染，三只动物（两只牛和一只小牛）被持续感染，一只小牛被认为是BVDV PI动物。系统发育分析中使用的BVDV 5'UTR和/或N pro 基因序列显示，这3只PI动物感染了3种不同的BVDV亚型（BVDV-1a，BVDV-1b和BVDV- 1d）。这些结果表明，在开放的奶牛畜群中，定期针对BVDV进行疫苗接种本身无法防止畜群中的病毒循环。此外，取决于获得小母牛和/或母牛以进行替换的频率，几种BVDV亚基因型可以同时存在于同一群中。

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