数字农科院2.0

An Attenuated Highly Pathogenic Chinese P.rrs Viral Vaccine Confers C ross Protection To Pigs Against Challenge With The Emerging Prrsv Nadc30-Like Strain

文献类型： 外文期刊

作者： Zhang, HW; Xia, MQ; Wang, W; Ju, DC; Cao, L; Wu, B; Wang, X; Wu, Y; Song, N; Hu, JX; Tian, CX; Zhang, SC; Wu, H

作者机构：

关键词： Porcine reproductive and respiratory syndrome virus (PRRSV); NADC30-like; Vaccine; Cross protection

期刊名称： VIROLOGICA SINICA

ISSN： 1674-0769

年卷期： 2018 年 33 卷 2 期

页码：

收录情况： JCR（2021版） ; CSCD（2020-2021年度） ; 科技核心（2020版）

摘要： A novel PRRSV strain was isolated in China that was genetically similar to the NADC30 strain which is reported to have spread throughout China. The objective of the present study was to evaluate the cross-protective efficacy of the live vaccine TJM-F92 in young pigs against challenge with a NADC30-like strain, HN201605. Twenty-five PRRSV- and antibody-free pigs were randomly divided into the following five groups: Vac/ChA, Unvac/ChA, Vac/ChB, Unvac/ChB and the mock. The pigs in groups Vac/ChA and Vac/ChB were inoculated intramuscularly with 1 mL TJM-F92 (10(5.0) TCID50/mL). At 28 days post vaccination (0 days post challenge), groups Vac/ChA and Unvac/ChA were inoculated intranasally with 10(4.5) TCID50/mL PRRSV strain TJ F3 (2 mL/pig), while groups Vac/ChB and Unvac/ChB were inoculated, using the same route, with the same dose of the NADC30-like strain HN201605 F3. Protective effects of the PRRSV strain were observed in all pigs in the Vac/ChA and Vac/ChB groups. Neither high fever nor signs of clinical disease were observed through the experiment in these groups, whereas pigs in Unvac/ChA group exhibited serious clinical symptoms, pathological lesions, and weight loss. In Unvac/ChB group, pigs developed milder clinical symptoms, which demonstrated that the NADC30-like strain HN201605 had moderate pathogenicity. The results suggest that the MLV vaccine strain TJM-F92 is an effective and safe vaccine candidate for use in China.

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