Pathogenesis of a genotype C strain of bovine parainfluenza virus type 3 infection in albino guinea pigs

文献类型： 外文期刊

第一作者： Shi, Hong-Fei

作者： Shi, Hong-Fei;Zhu, Yuan-Mao;Dong, Xiu-Mei;Cai, Hong;Ma, Lei;Wang, Shu;Yan, Hao;Wang, Xue-Zhi;Xue, Fei

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关键词： Bovine parainfluenza virus type 3;Pathogenesis;Real-time RT-PCR;Genotype C;Guinea pig

期刊名称：VIRUS RESEARCH （ 影响因子：3.303； 五年影响因子：3.445 ）

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收录情况： SCI

摘要： Bovine parainfluenza virus type 3 (BPIV3) is one of the most important of the known viral respiratory tract agents of both young and adult cattle and widespread among cattle around the world. Up to present, three genotypes A, B and C of BPIV3 have been described on the basis of genetic and phylogenetic analysis and only limited studies on the pathogenesis of the genotype A of BPIV3 infection in calves and laboratory animals have been performed. The report about experimental infections of the genotypes B and C of BPIV3 in laboratory animals and calves was scant. Therefore, an experimental infection of guinea pigs with the Chinese BPIV3 strain SD0835 of the genotype C was performed. Sixteen guinea pigs were intranasally inoculated with the suspension of 5D0835, while eight control guinea pigs were also intranasally inoculated with the same volume of supernatant from uninfected MDBK cells. The virus-inoculated guinea pigs displayed a few observable clinical signs that were related to the respiratory tract disease and two of the sixteen experimentally infected guinea pigs died at 2 and 3 days post inoculation (PI), respectively, and apparent gross pneumonic lesions Were observed at necropsy. The gross pneumonic lesions in guinea pigs inoculated with 5D0835 consisted of dark red, slightly depressed, irregular areas of consolidation in the lung lobes from the second to 9th day of infection at necropsy, and almost complete consolidation and atelectasis of the lung lobes were seen at 7 days PI. Histopathological changes including alveoli septa thickening and focal cellulose pneumonia were also observed in the lungs of guinea pigs experimentally infected with SD0835. Viral replication was detectable by virus isolation and titration, real-time RT-PCR and immunohistochemistry (IHC) staining in the respiratory tissues of guinea pigs as early as 24 h after intranasal inoculation with SD0835. The results of virus isolation and titration showed that guinea pigs were permissive for SD0835 replication and exhibited a higher virus replication level in both lungs and tracheas. As well, the results of IHC staining implicated that the lungs and tracheas were the major tissues in which SD0835 replicated. Virus-specific serum neutralizing antibodies against BPIV3 were detected in virus-inoculated guinea pigs. The aforementioned results indicated that BPIV3 strain SD0835 of the genotype C was pathogenic to guinea pigs and could cause a few observable clinical signs, and gross and histologic lesions in virus-inoculated guinea pigs. Thus guinea pig is an ideal laboratory animal infection model for BPIV3 and would cast more light on the genotype C of BPIV3 infection process, in vivo tropism and pathogenesis or serve as a useful system for monitoring the pathogenesis of SD0835 and other BPIV3 isolates. (C) 2014 Elsevier B.V. All rights reserved.

分类号： R37

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