测量病原体对机体感染的程度的指标包括致病力（pathogenicity）和毒力(virulence)。致病力（pathogenicity），即病原体引起宿主的患病能力。以病原体引起疾病的具有临床症状的病例数与暴露于感染人数之比作为测量某病原体致病力的指标。毒力，即表明疾病严重程度，以严重病例数或致死数与所有病例数之比作为测量某病原体毒力的指标。一般认为，致病力的大小取决于病原体在体内的繁殖速度、组织损伤的程度以及病原体能否产生特异性毒素。
n. virulence ; pathogenicity
病原体毒力(virulence)，致病力(pathogenicity)。侵袭力（invastiveness）:吸附和侵入能力；繁殖与扩散能力；抵抗宿主防御功能的能力。
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In order to pinpoint the key amino acids that affected virulence, we generated many PA mutant viruses and tested them on ducks.
为进一步在PA上寻找其影响致病力的关键位点,我们拯救出一系列PA突变的病毒,并且做了感染家鸭实验。
参考来源 - H5N1亚型禽流感病毒对家鸭致病力分子机制的研究The examination about virulence showed that the CPS did not have directly virulence. The CPS was injected into the peritoneal cavity of European eels(Anguillia anguillia).
毒力试验表明,CPS对欧鳗无直接致病力。
参考来源 - 创伤弧菌FJ03·2,447,543篇论文数据，部分数据来源于NoteExpress
HD V有高度的传染性，及很强的致病力。
HDV infection having highly, and very strong with the result that disease dint.
还从供试菌株中筛选出一套具有稳定致病力的鉴别菌株。
A set of strains with stable pathogenicity by screening from the strains tested were selected.
目的：了解71株肠道病原菌的耐药性及对小鼠的致病力。
Objective: to investigate the drug resistances of 71 strains enteropathogens and pathogenicity to mouse.
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