在实验性牛结核病的早期阶段检测病原体
Mitchell V Palmer1, Carly Kanipe1, Soyoun Hwang2
1Bacterial Diseases of Livestock Research Unit, National Animal Disease Center, United States Department of Agriculture, 1920 Dayton Ave, Ames, IA 50010, USA.
Veterinary sciences
|August 28, 2024
概括
早期发现牛结核是一项挑战. 这项研究在感染后8周内在小牛鼻和唾液中发现了Mycobacterium bovis DNA,这为早期疾病检测提供了潜力.
科学领域:
- 兽医微生物学 兽医微生物学
- 传染性疾病 传染性疾病
- 动物健康 动物健康
背景情况:
- 牛结核病 (BTB) 是由Mycobacterium bovis引起的,这是一个重要的动物传染病原体.
- 目前的诊断方法,如皮肤测试和干扰素玛释放试验,难以早期检测感染,从而使传播成为可能.
- 在体液中早期检测M. bovis DNA可能是一个潜在的替代诊断方法.
研究的目的:
- 为了调查M. bovisDNA在经过实验感染的小牛的鼻分泌物,唾液和血液中的存在和流失模式.
- 为了将M. bovis DNA检测与传统的诊断方法和粗病变评分进行比较.
主要方法:
- 实验性气溶感染18头小牛的M. bovis.
- 在感染后的8周内,每周收集鼻,唾液和血液样本.
- 实时PCR用于M. bovisDNA检测,培养可活细菌,干扰素玛释放试验,以及ELISA用于抗体检测.
主要成果:
- 在一组受感染的小牛的鼻子抽样 (第5,6,8周) 和唾液 (第1,7,8周) 中检测到M. bovisDNA.
- 可培养的M. bovis没有从鼻或唾液中恢复.
- 在血液样本中没有检测到M. bovisDNA.
- 干扰素玛释放测定证实了所有小牛的感染;ELISA在研究的晚期检测到少量动物的抗体.
- 疾病严重程度 (损伤评分) 与脱落或抗体反应无关.
结论:
- 在鼻和唾液中检测到M. bovis的DNA可能比目前的方法提供更早的诊断标记.
- 没有可培养的细菌表明过渡性脱落或PCR检测到的低细菌负载.
- 需要进一步的研究来验证这些发现,以便在实践中对牛结核病进行监测.
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