The dynamic changes of tissue structure in 4 days old ducklings which were infected with chicken embryo attenuated strain MY of duck hepatitis virus were observed.
对鸭肝炎鸡胚化弱毒株MY接种4日龄雏鸭后的组织变化进行了动态观察比较研究。
Conclusion The JEV attenuated strain SA14-14-2 is genetic stability after passaged continuously on PHKC to 20 generations, and proved a good safety on molecular level.
结论乙脑病毒减毒株sa14 - 14 - 2的遗传学特性稳定，从分子水平证明了乙脑减毒活疫苗的安全性。
The results showed that the numbers of IEL in tracheas was increased significantly (P<0.01) with PRRS attenuated strain immunization by nasal route contrast to muscle injection and control group;
气管IEL数目的变化：PRRS弱毒株鼻腔免疫组IEL数量比对照组和肌肉免疫组呈极显著增加（P<0.01），PRRS弱毒株肌肉注射免疫组IEL数量与对照组无显著变化。
Conclusion The attenuated measles virus strain is different from strong virus strain.
结论麻疹病毒的减毒株与强毒株存在差异。
Objective To establish a specific method for identifying varicella-zoster virus (VZV) strains and analyze the genetic characteristics of VZV84-7, an attenuated VZV strain isolated in China.
目的建立水痘带状疱疹病毒(VZV)毒株的特异性鉴定方法，研究我国分离的VZV84 7减毒株(VZV84 7株)基因特征。
The immune response of attenuated JE vaccine virus strain was reported.
乙脑病毒减毒株注入脑内后，病毒繁殖受抑并被清除；
So it's has great significance to construct the mutant storehouse and slecte the toxicity weak Hps mutant strain for developing the genetic engineering attenuated vaccine.
如构建出突变体库，从中筛选出毒力减弱的副猪嗜血杆菌突变菌株，对研制出基因工程弱毒活疫苗具有重要意义。
Objective To observe the adverse reaction and immunogenicity induced by live attenuated measles vaccine prepared with purified virus seeds of Chang-47 strain in infants aged 8 ~ 10 months.
目的观察麻疹长- 47株纯化毒种制备的麻疹减毒活疫苗在8 ~10月龄人群中的接种反应及免疫原性。
In order to study the attenuation of neurovirulence of SA14 14 2 attenuated vaccine virus, monkeys and mice were tested with the strain and its parent SA14 virulent strain.
为了解乙型脑炎（乙脑）减毒活疫苗弱毒株SA14142神经毒力的减弱程度，本文对弱毒株及其原株SA14强毒株进行了猴体和小白鼠的致病性和病理学变化的比较试验。
The invention also discloses the application of the gene deleted bacterial strain in preparing the Bordetella bronchiseptica gene deleted vaccine (attenuated live vaccine).
本发明还公开了所述基因缺失菌株在制备支气管败血波氏杆菌基因缺失疫苗（弱毒活疫苗）的应用。
The C_(135) strain attenuated from a prototype of streptococcus suis through repeated insusceptible chicken passage pathway is successful and here presented.
本试验用强迫猪链球菌反复通过不易感的鸡体继代的生物学方法，选育出一株弱毒猪链球菌。
The C_(135) strain attenuated from a prototype of streptococcus suis through repeated insusceptible chicken passage pathway is successful and here presented.
本试验用强迫猪链球菌反复通过不易感的鸡体继代的生物学方法，选育出一株弱毒猪链球菌。
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