The virus did not mutate to a more virulent form.
病毒没有变异为致命性更强的形态。
Before 1997 WNV was not considered pathogenic for birds, but at that time in Israel a more virulent strain caused the death of different bird species presenting signs of encephalitis and paralysis.
在1997年以前，西尼罗河病毒并未被认为对鸟类具有致病性，但就在那时，以色列出现了一种能够导致多种鸟类出现脑炎和麻痹症状继而死亡的毒力更强的毒株。
At present, most swine flu infections are mild, and the severity of the present pandemic does not come close to the 1918 flu, but experts worry that the new virus could become more virulent over time.
目前大部分的猪流感病例都很轻微，这次大流行的严重程度远远低于1918年流感，然而专家们担心新型流感的毒力会越来越强。
Avian flu is not only particularly virulent; italso has the rare capacity to cross barriers between species. But it is hard totransmit.
这种传染病不但致命，而且少有地能跨物种传播，但其传染性有限，禽肉只要充分加热，便不具危险。
In recent days, genetic sequencing analyses of this flu have suggested it is not as virulent as suspected.
最近几天，对H1N 1流感病毒的基因测序分析表明，这种病毒的毒性不像之前所认为的那样致命。
Pustulant tumors that become infested with maggots deform their faces, forcing teeth from their jaws. The devils eventually starve, but not before passing on the virulent cancer.
在脓胞肿瘤出现大量的蛆寄生后，袋獾的面部会严重畸形，使下颚的牙齿突出、无法咬合，染病的袋獾会先把致命肿瘤传染给其他个体，最后才挨饿而死。
It had not been emitted directly by fuel rods, which would be far more virulent, they said.
它没有被排出的燃料棒，这将是更致命的直接，他们说。
The pathogenicity of P. grisea isolates differ from various regions, and many cultivars (lines) or combinations are highly resistant to P. grisea and their virulent frequency are not more than 20%.
结果表明，不同稻区稻瘟病菌菌株对籼、粳、杂交稻的致病力存在明显差异。筛选出一批毒力频率在20%以下，抗性较好的籼、粳稻新品种（系）和杂交稻新组合。
Sharon StoneYour this does not have the conscience, inhuman, feeble-minded virulent woman.
莎朗斯通你这个没有良知，灭绝人性，低能恶毒的女人。
Sharon StoneYour this does not have the conscience, inhuman, feeble-minded virulent woman.
莎朗斯通你这个没有良知，灭绝人性，低能恶毒的女人。
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