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一种活减弱的化学疫苗候选剂,用于对抗新兴的NADC34样PRRSV

Zhengqin Ye¹, Zhendong Zhang¹, Zhenbang Zhu¹

¹Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, College of Veterinary Medicine, Yangzhou University, Yangzhou 225012, China.

Veterinary sciences

|April 23, 2025

概括

一种新的重组猪生殖和呼吸系统综合征病毒 (PRRSV) 疫苗,rNADC34-CHSps,在保护猪免受NADC34类菌株的影响方面表现有前途. 这种改造的PRRSV有效地保护小猪免受毒性挑战,证明了疫苗有效性的提高.

科学领域:

兽医病毒学兽医病毒学
动物卫生动物健康
疫苗开发疫苗开发

背景情况:

类似NADC34的猪生殖和呼吸系统综合征病毒 (PRRSV) 在中国的猪业造成了重大经济损失.
现有的商业疫苗对类似NADC34的PRRSV提供了不充分的保护.
类似NADC34菌株对细胞培养的适应性差,阻碍了疫苗的开发.

研究的目的:

开发一种新型的候选疫苗,有效对抗类似NADC34的PRRSV.
为疫苗生产设计一种具有改善细胞培养适应性的重组PRRSV.
在小猪模型中评估工程疫苗的疗效.

主要方法:

通过在PRRSV菌株之间交换结构蛋白区域来设计一个重组PRRSV (rNADC34-CHSps).
在Marc-145细胞中培养并传递复合病毒以确保稳定性和高位数.
接种rNADC34-CHSps的猪仔接种疫苗,然后用一种致命的NADC34类PRRSV菌株挑战它们.

主要成果:

重组病毒rNADC34-CHSps在Marc-145细胞中表现出强大的增殖和稳定的生长.
接种疫苗的猪仔产生了PRRSV特异性抗体,并且在挑战后没有表现出任何临床症状.
与对照组相比,接种疫苗的猪仔体重增加有所改善,病理病变减少,病毒血量降低.

结论:

在猪中,rNADC34-CHSps候选疫苗对类似NADC34的PRRSV感染有效.
有针对性的基因组修改可以提高PRRSV疫苗的适应性和有效性.
这种方法为开发下一代PRRSV疫苗提供了一个有希望的战略.

关键词:

在Marc-145细胞中.这是一种类似NADC34的菌株.PRRSVV 在这个问题上.基因组的修改是基因组的修改.猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪猪疫苗疫苗疫苗疫苗

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