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马雷克病病毒在中国的和火中的基因组演变
Wen Li1, Huifang Meng1, Xianghui Liang1
1Guangdong Laboratory for Lingnan Modern Agriculture, State Key Laboratory for Animal Disease Control and Prevention, Center for Emerging and Zoonotic Diseases, College of Veterinary Medicine, South China Agricultural University, Guangzhou, 510642, People's Republic of China.
Virus genes
|October 18, 2023
概括
在中国接种疫苗的和火中,马雷克病 (MD) 爆发是由高度毒性,耐疫苗的MDV菌株引起的. 由于病毒的演变和疫苗免疫不完全,持续监测至关重要.
科学领域:
- 兽医病毒学 兽医病毒学
- 禽类疾病流行病学
- 进化生物学 进化生物学
背景情况:
- 马雷克病 (MD) 病毒是全球家禽中普遍存在和不断发展的病原体.
- 尽管疫苗接种广泛,但MD疫情仍在持续,在中国观察到病毒性增加.
- 后院农场对疾病控制和病毒进化提出了独特的挑战.
研究的目的:
- 为了调查在中国广东省接种疫苗的和未接种疫苗的火中爆发的马雷克病.
- 描述涉及的马雷克病病毒 (MDV) 隔离物的遗传多样性和进化关系.
- 评估MDV疫苗突破和宿主范围扩张的潜力.
主要方法:
- 来自和火的MDV分离物的家族遗传学分析.
- 实地分离物和疫苗菌株之间的遗传差异的比较.
- 评估马雷克病病毒 (MDV) 血统及其与毒性和疫苗耐药性的关系.
主要成果:
- 在疫情爆发期间,两种不同的MDV血统被确定.
- 一个在和火中发现的血统,与毒性中国菌株聚集在一起,与疫苗菌株有显著的遗传差异,表明疫苗突破.
- 第二个血统包括与疫苗菌株 (CVI988和814) 遗传上相似的分离物.
结论:
- 这次疫情突出显示,中国出现了毒性,抗疫苗的MDV菌株,能够感染和火.
- 复杂的MDV循环,由生物安全性差和疫苗免疫力不完整等因素驱动,促进病毒进化.
- 持续监测MDV演变和宿主范围对于禽业的有效疾病管理至关重要.
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