在埃塞俄比亚中部的小牛中检测和分子表征主要的肠道病原体
Julia Bergholm1, Tesfaye Sisay Tessema2, Anne-Lie Blomström3
1Department of Animal Biosciences, Swedish University of Agricultural Sciences, Uppsala, Sweden. julia.bergholm@slu.se.
BMC veterinary research
|September 3, 2024
概括
埃塞俄比亚的小牛腹是由大肠杆菌K99+,Cryptosporidium,轮状病毒A和BCoV引起的. 这项研究确定了常见和罕见的病原体菌株,包括非洲的新型轮状病毒G24基因型.
科学领域:
- 兽医医学 兽医医学 兽医医学
- 分子生物学分子生物学
- 传染性疾病 传染性疾病
背景情况:
- 小牛腹严重影响全球的牲畜健康和经济,埃塞俄比亚小牛的发病率和死亡率很高.
- 关于埃塞俄比亚牛肠道病原体的分子特征的研究有限.
- 肠毒性大肠杆菌 (大肠杆菌K99+),Cryptosporidium spp.,轮状病毒A (RVA) 和牛冠状病毒 (BCoV) 是导致小牛腹的主要原因.
研究的目的:
- 在埃塞俄比亚中部的小牛中检测和分子描述四种关键的肠道病原体.
- 在腹和非腹的小牛中调查大肠杆菌K99+,Cryptosporidium spp.,RVA和BCoV的流行率.
- 为该地区流通的牛肠病原体菌株提供遗传洞察力.
主要方法:
- 从埃塞俄比亚中部的腹和非腹小牛身上收集了便样本.
- 抗原ELISA和定量实时PCR (qPCR) 用于病原体检测.
- 阳性样本经过基因定型PCR进行分子表征.
主要成果:
- 所有四种向病原体都在小牛中检测到,不管它们的腹状况如何.
- 鉴定出了三种Cryptosporidium物种 (C. andersoni,C. bovis,C. ryanae) 的存在.
- 发现了一种常见的牛RVA基因型 (G10P[11]) 和一种新的G24基因型,标志着在埃塞俄比亚和非洲的首次检测.
- 确定了两种不同的BCoV菌株:一种经典菌株和一种类似牛的菌株.
结论:
- 埃塞俄比亚小牛中流行的是Cryptosporidium spp.,大肠杆菌K99+,RVA和BCoV. 在埃塞俄比亚小牛中流行.
- 发现罕见的RVA G24基因型和一种类似牛的CoV突显了基因表征对于理解病原体多样性的重要性.
- 这项研究提供了埃塞俄比亚牛肠道病原体的关键分子数据,为疾病控制策略提供了信息.
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