field outbreak meaning in English
现场爆发
Examples
- The conditions under which field outbreaks take place are fairly defined .
在野外情况下的发病已充分肯定。 - More importantly , all the strains isolated after 1998 belonged to genotype vfl and 8 out of 15 strains isolated after 1990s were in this group . the results showed that genotype vii viruses were the predominant nd viruses responsible for field outbreaks in china in recent years
属于姐型的8个毒株在90年代以后分离株中占有最大的比例且全部是97年以后分离的， 98年以后分离的ndv毒株均属于vii型，说明vll型毒株是我国部分地区正在发生nd流行的优势基因型，与国内外报道的第四次大流行的流行特征一致。 - The results of biological tests have demonstrated that allantoic fluid of the first passage virus did n ' t produce macroscopic pathogenic role to chicken embryos and after passaged for four times , gross lesions were observed in chicken embryo . the virus showed typical coronavirus under electron - microscope and it could n ' t form plaque in cef cells and could hemagglutinates chicken red blood cells after treatment with 1 % trypsin . to surprise , the virus replicated in cef cells also showed hemagglutination activity to chicken red blood cells . in addition , the spf chickens which inoculated with the virus isolated from the chicken damaged tissue showed clinical sign and grow lesion , but it ' s gross lesion did n ' t resemble to those of field outbreaks
生物学特性：鸡胚尿囊液经离心、磷钨酸负染后，电镜观察该病毒为典型的冠状病毒；该毒株的第一代尿囊液对鸡胚无肉眼可见的致病作用，当继代到第5代后，胚体严重病变；病毒在鸡胚中随着接种时间的延长，其效价增高， 96h可达到48h的2倍；该毒株可在cef上生长，但不能形成明显的蚀斑；经1胰酶处理后可凝集鸡红细胞；鸡胚的第四代尿囊液病毒回归动物体，病死鸡肾脏呈典型的花斑肾，腺胃则未见肉眼可见的病变。