一个新兴的高毒性重组血统的遗传和致病特征 韩国Clade C PRRSV菌株
1Department of Veterinary Pathology, College of Veterinary Medicine, Seoul National University, Seoul 08826, Republic of Korea.
Transboundary and emerging diseases
|April 30, 2025
概括
在韩国发现了一种新型,高度毒性的猪生殖和呼吸系统综合征病毒 (PRRSV) 菌株SNUVR220803. 这种韩国C类C复合菌株在猪中引起严重的呼吸道疾病和高死亡率.
科学领域:
- 兽医病毒学 兽医病毒学
- 动物病理学 动物病理学
- 分子流行病学分子流行病学
背景情况:
- 猪生殖和呼吸系统综合征病毒 (PRRSV) 对猪健康和全球猪肉生产构成重大威胁.
- 新型PRRSV菌株的出现需要持续监测和表征,以了解不断变化的致病性.
- 之前的研究已经确定了各种PRRSV血统,包括韩国基因,但具有独特遗传特征的重组菌株需要详细调查.
研究的目的:
- 来自韩国的新发现的PRRSV菌株的隔离,表征和确定病原性.
- 进行遗传学和全基因组分析,以了解遗传起源和重组的潜力.
- 评估新型猪PRRSV菌株引起的临床,病理和免疫反应.
主要方法:
- 从受影响的猪肺组织中分离和识别PRRSV.
- 对ORF5基因和全基因组测序的遗传学分析.
- 用临床,病理和免疫学评估进行动物接种实验.
- 总体和显微病理检查,包括用于病毒抗原检测的免疫组织化学.
- 在受感染的猪中量化关键细胞因子水平 (TNF-α,IFN-α,IL-10).
主要成果:
- 一种新型PRRSV菌株,SNUVR220803,属于韩国C类 (LKC) 血统,被分离出来.
- 全基因组分析显示SNUVR220803是LCK和5系PRRSV之间的重组菌株,具有独特的NSP2删除.
- 接种疫苗的猪表现出严重的临床症状,包括高热,,蓝色,呼吸困难,缓解症,死亡率为58.3%.
- 总体病理学显示有血清性输液,而显微镜分析显示严重的间歇性肺炎.
- 在受感染的猪中观察到高水平的促炎细胞因子 (TNF-α,IFN-α) 和IL-10.
结论:
- 在猪中,LKC重组PRRSV菌株SNUVR220803表现出高毒性和传染性.
- 独特的遗传构成,包括Nsp2删除和与5系重组,可能有助于其致病性.
- 这一发现突显了PRRSV的持续演变以及猪群中潜在的更具毒性菌株的出现.
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