对在中国流传的传染病病毒菌株的遗传学和病原学分析
Xun Jing1, Qi Tong1, Wenbin Chen1
1State Key Laboratory of Veterinary Public Health and Safety, Department of Preventive Veterinary Medicine, College of Veterinary Medicine, China Agricultural University, Beijing 100193, People's Republic of China; Key Laboratory for Prevention and Control of Avian Influenza and Other Major Poultry Diseases of the Ministry of Agriculture and Rural Affairs, Beijing 100193, People's Republic of China.
Poultry science
|November 21, 2025
概括
在中国的传染性毛囊病病毒 (IBDV) 基因型显示病原性降低,但引起显著的毛囊缩. 监测亚临床感染对于防止家禽养殖业的经济损失至关重要.
科学领域:
- 兽医病毒学 兽医病毒学
- 禽类病理学 禽类病理学
- 分子流行病学分子流行病学
背景情况:
- 传染病 (IBD) 是家禽的主要免疫抑制性疾病,在中国流行超过40年.
- 最近的IBDV疫情显示死亡率降低,需要对当前菌株的流行率和病原性进行调查.
研究的目的:
- 从中国接种疫苗的家禽养殖场中分离和鉴定传染病病毒 (IBDV) 菌株.
- 评估循环IBDV基因型的遗传多样性和病原性.
主要方法:
- 对IBDV分段A (HVR) 和B (B标记物) 的遗传学分析以确定基因型.
- 从中国中部和东部分离和描述23种IBDV菌株.
- 在无特定病原体 (SPF) 中进行致病性评估,包括死亡率,体比重指数 (BBIX),组织病理学和病毒载荷的确定.
主要成果:
- 遗传学分析确定了在中国共传播的多种IBDV基因型,包括A2.2B1,A3.2B3.2和A3.5B3.3.3.
- 新出现的A3.2B3.2基因型与参考菌株有很大的差异.
- 虽然没有观察到死亡率,但所有测试的菌株都显著降低了BBIX,并导致严重的bursal缩,带有他的病理病变和系统性病毒复制.
结论:
- 多种IBDV基因型正在中国流传,其中一些表现出显著的遗传差异.
- 尽管观察到的致病性降低了,但这些菌株会引起严重的胸腔损伤和全身感染.
- 亚临床感染可能促进病毒传播并造成经济损失,这凸显了持续监测和疾病管理战略的必要性.
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