德克萨斯州乳牛H5N1病毒的优异复制,致病性和免疫逃避与历史的鸟类分离物相比
Cassio Pontes Octaviani1, Pinghan Huang2, Peng Bi-Hung3
1Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX, USA. caoctavi@utmb.edu.
Scientific reports
|March 15, 2025
概括
高致病性禽流感H5N1在牛群中显示在人类细胞和小鼠中增强了生长和致病性. 这种奶牛H5N1病毒可能具有天生的免疫逃生机制,引发了公众健康的担忧.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 公共卫生 公共卫生
背景情况:
- 美国乳牛中持续爆发的高致病性禽流感 (HPAI) H5N1类2.3.4.4b疫情导致了广泛的农场感染和人类病例.
- 这种情况加剧了卫生当局和研究人员对潜在的动物传播和疾病严重性的担忧.
研究的目的:
- 从德克萨斯州奶牛中分离出来的H5N1病毒的体外和体内特征.
- 为了比较其生长,病原性和宿主-病原体相互作用与较旧的HPAI隔离物.
主要方法:
- 在人肺细胞系中病毒生长的体外分析.
- 在小鼠模型中进行体内致病性研究,评估肺病理,病毒标位和死亡率.
- 评估病毒对抗RIG-I和MDA5先天抗病毒信号通路的能力.
主要成果:
- 牛源的H5N1病毒在人肺细胞中体外表现出优异的生长和快速复制,与较旧的分离物相比.
- 在体内研究显示,小鼠的病原性增加,其特点是严重的肺病理,高脑病毒载荷,以及在不同接种途径上显著的死亡率.
- 牛H5N1分离物证明了对RIG-I和MDA5-介导的先天免疫反应的有效对抗作用.
结论:
- 从奶牛中分离出来的H5N1病毒具有显著的致病性和增强的复制能力.
- 病毒对抗天生的抗病毒途径的能力表明免疫逃避的潜在机制.
- 这些发现凸显了对在牲畜中传播的H5N1菌株及其对人类健康的影响的持续监测和研究的迫切需要.
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