There was worry that a mutation could occur in the disease which would make the disease virulent enough to attack clones hitherto regarded as resistant . 麻烦的事是病原菌可能发生突变，以致病害变得更厉害，使原来是抗病的无性系也能感染。
Its mortality rate , in its most virulent strains , is 90 % 就有毒菌株而言，死亡率高达90 % 。
Its mortality rate , in its most virulent strains , is 90 % 最致命的病毒株引起的死亡率达到90 % 。
Study of emergency treating on virulent chemicals ' leakage accident 剧毒化学品泄漏事故应急处置研究
Detection of specific gene and analysis of virulent gene of e . coli o157 h 7特异基因检测与毒力基因分析
It has created one kind of most common virulent venereal diseases 它造成了一种最常见的病毒性性病std 。
Its mortality rate , in its most virulent strains , is 90 % 由于该病毒含有剧毒的菌株，因此它的致死率为90 % 。
Diagnostic technique for virulent marek ' s disease virus infection of chickens 鸡马立克氏病强毒感染诊断技术
Primary analysis of virulent genes of 114 strains ehec o157 : h7 in anhui province 7菌株毒力因子基因的初步分析
Construction of infectious clones of very virulent gx strain of infectious bursal disease virus 株感染性分子克隆的构建
