猪繁殖与呼吸综合征病毒
异源的
病毒学
生物
接种疫苗
病毒
拉伤
免疫系统
减毒疫苗
谱系(遗传)
免疫
免疫学
基因
毒力
遗传学
解剖
作者
Zhijun Tian,Hongliang Zhang,Lirun Xiang,Hu Xu,Chao Li,Yan‐Dong Tang,Bangjun Gong,Wenli Zhang,Jing Zhao,Shanshan Song,Jinmei Peng,Qian Wang,Tongqing An,Xuehui Cai
出处
期刊:Authorea - Authorea
日期:2022-03-31
标识
DOI:10.22541/au.164873626.61635141/v1
摘要
Porcine reproductive and respiratory syndrome virus (PRRSV) is an important pathogen that endangers the swine industry worldwide. Recently, lineage 1 PRRSVs, especially NADC30-like PRRSV, have become the major endemic strains in many pig-breeding countries. Since 2016, NADC30-like PRRSV has become the predominant strain in China. Unfortunately, current commercial vaccines cannot provide sufficient protection against this strain. Here, an attenuated lineage 1 PRRSV strain, named SD-R, was obtained by passaging NADC30-like PRRSV strain SD in Marc-145 cells for 125 passages. Four-week-old PRRSV-free piglets were vaccinated intramuscularly with 10 TCID SD-R and then challenged intramuscularly (2 ml) and intranasally (2 ml) with homologous NADC30-like PRRSV SD (1×10 TCID /ml) and heterologous NADC30-like PRRSV HLJWK108-1711 (1×10 TCID /ml). The results showed that 5 of 5 immunized piglets had a perceptible humoral immune response to vaccination and did not develop fever or clinical diseases after NADC30-like PRRSV challenge. Additionally, compared to challenge control piglets, vaccinated piglets gained significantly more weight and showed much milder pathological lesions. Furthermore, the viral replication levels of the immunized group were significantly lower than those of the challenge control group. These results demonstrate, for the first time, that lineage 1 PRRSV SD-R is a good candidate for an efficacious vaccine against NADC30-like PRRSVs.
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