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1·Health experts are worried that a new, more virulent strain may be to blame.

卫生专家担心这一现象归咎于一种毒力更强的新菌种。

2·Finally FCT10.10 was selected as the highest virulent strain for production.

最终筛选出FCT10.10为诱变筛选出的高毒力菌株，可作为生产菌株。

3·It remains to be seen whether the virus will mutate into a more virulent strain.

该病毒是否会产生变异，成为毒性更强的病毒株，仍有等观察。

4·Conclusion The infection of virulent strain of mouse poxvirus exists in experimental mice.

结论实验用昆明小鼠中存在鼠痘病毒强毒株感染。

5·Half of the victims have been hospitalised, a high rate that may indicate an especially virulent strain of E. coli.

半数受害者都已住院，如此高的住院率表明这可能是一种毒性特别强的大肠杆菌菌株。

6·At this point, there isn't a lot of data to suggest this is a more virulent strain, said Dr. Ian Williams of the Centers for Disease Control and Prevention.

“在这件事上，没有充足的数据表明这是更严重的病毒体”，美国疾病控制防疫中心伊恩。威廉母斯博士说。

7·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SA14 14 2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。

8·One in five lung cancer sufferers have a particularly virulent strain called small cell lung cancer which kills all but three per cent of sufferers within five years of diagnoses.

1/5的癌症患者带有一种特别的有毒病株，称为小细胞肺癌，这种肺癌五年内杀死了近3%的确诊患者。

9·After little more than an informal examination, the doctor concluded that Mr. Malcolm Smith's organism was infested with a particularly virulent strain of the influenza virus.

做完非正式的检查后，医生得出结论，马尔科姆·史密斯的机体大量滋生了一种非常致命的流感病毒。

10·The authors argue the version of the disease that caused the medieval plague is likely extinct, but suggest that further study could reveal how it may have evolved into a less virulent strain.

作者们称引起中世纪瘟疫的品种可能已经灭绝了，但是他们认为进一步的研究可以揭示它是如何进化到一种没那么致命的类型。