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Fluorescent microspheres as a positive indicator in an intratracheal infection model.
Journal of Microbiological Methods ( IF 1.7 ) Pub Date : 2020-03-09 , DOI: 10.1016/j.mimet.2020.105886
Spencer A Leigh 1 , Scott L Branton 1 , Jeff D Evans 1 , Stephanie D Collier 1
Affiliation  

Animal models testing the ability of vaccines and therapeutic agents to prevent pathology from induced respiratory infection are an important means of testing and validating the vaccines and therapeutic agents. However, the lack of induced pathology in test subjects could be either indicative of protection or a problem with the animal model system. This work describes the improvement of a chicken model system of intratracheal infection using fluorescent microspheres as a positive indicator of infection. It was shown that fluorescent microspheres and Mycoplasma gallisepticum bacteria both dispersed to the same areas of the chicken respiratory system and that the microspheres remained detectable in the chicken lung tissue for at least 7 days following infection. The microspheres used are detectable using a black light, allowing for visualization during necropsy. Using the updated model system, three live M. gallisepticum vaccines were tested both for their ability to elicit a humoral immune response following vaccination, and for their ability to protect from air sac lesion pathology at two different time points following vaccination. Results showed the protective effects of the different M. gallisepticum vaccines prevented the induction of pathology, consistent with previous results. The presence of the fluorescent microspheres provided a positive method of identifying the properly infected chickens and a means of differentiating failed experimental infections so that those samples could be removed, resulting in improved consistency in infection results.

中文翻译:

荧光微球在气管内感染模型中作为阳性指标。

测试疫苗和治疗剂预防病理性疾病引起的呼吸道感染的能力的动物模型是测试和验证疫苗和治疗剂的重要手段。但是,测试对象缺乏诱发的病理可能表明存在保护作用或动物模型系统存在问题。这项工作描述了使用荧光微球作为感染阳性指标的气管内感染鸡模型系统的改进。结果表明,荧光微球和鸡支原体细菌均散布在鸡呼吸系统的同一区域,感染后至少7天仍可在鸡肺组织中检测到微球。所用的微球可通过黑光检测到,可以在尸检时进行可视化。使用更新的模型系统,测试了三种活鸡毒支原体疫苗在疫苗接种后引起体液免疫应答的能力以及在疫苗接种后两个不同时间点的抗囊囊病变的能力。结果表明,不同的鸡毒支原体疫苗的保护作用阻止了病理学的诱导,与以前的结果一致。荧光微球的存在提供了一种确定适当感染的鸡的积极方法,并提供了一种区分失败的实验感染的方法,从而可以去除那些样品,从而提高了感染结果的一致性。在疫苗接种后两个不同的时间点,分别测试了鸡败血症疫苗的引发体液免疫反应的能力以及预防囊囊病变的能力。结果表明,不同的鸡毒支原体疫苗的保护作用阻止了病理学的诱导,与以前的结果一致。荧光微球的存在提供了一种确定适当感染的鸡的积极方法,并提供了一种区分失败的实验感染的方法,从而可以去除那些样品,从而提高了感染结果的一致性。在疫苗接种后两个不同的时间点,分别测试了鸡败血性疫苗的引发体液免疫反应的能力以及预防气囊囊病变的能力。结果表明,不同的鸡毒支原体疫苗的保护作用阻止了病理学的诱导,与以前的结果一致。荧光微球的存在提供了一种确定适当感染的鸡的积极方法,并提供了一种区分失败的实验感染的方法,从而可以去除那些样品,从而提高了感染结果的一致性。结果表明,不同的鸡毒支原体疫苗的保护作用阻止了病理学的诱导,与以前的结果一致。荧光微球的存在提供了一种确定适当感染的鸡的积极方法,并提供了一种区分失败的实验感染的方法,从而可以去除那些样品,从而提高了感染结果的一致性。结果表明,不同的鸡毒支原体疫苗的保护作用阻止了病理学的诱导,与以前的结果一致。荧光微球的存在提供了一种确定适当感染的鸡的积极方法,并提供了一种区分失败的实验感染的方法,从而可以去除那些样品,从而提高了感染结果的一致性。
更新日期:2020-03-09
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