Computer viruses act like biologics in the way they can be set off: they can be virulent from the outset of the infection or they can be activated by a specific event (logic bomb).

计算机病毒的传播行为与生物病毒极其相似：它们可能从开始感染时就是致命的，可以被某些特定的事件所引发(逻辑炸弹)。

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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。

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Jewaun was transferred to the children's hospital at the University of Chicago, where doctors discovered that a frighteningly virulent staph infection--impervious to standard antibiotics--had begun at the knee and spread through the body.

FORBES: Germ Warfare

To his great shock, he discovered an infection of virulent greed destroying a venerable culture of excellence, a culture that attracted him to Goldman with all the exuberance of his youthful talent and ambition.

FORBES: From Greg Smith To Bernie Madoff To Us

In mice, Fouchier said, the mutation makes the infection as much as 1, 000 times more virulent.

CNN: New bird flu well-adapted to infect people