此类型攻击中使用的系统可能以多种方式被破坏并受到蠕虫或病毒感染。

Systems used in this type of attack can be compromised in any number of ways and infected with a worm or virus.

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猪流感病毒被认为通过猪之间的近距离接触进行传播，另一种可能的传播方式是携带病毒的物体将病毒从被感染的猪群传播到健康的猪群中。

Swine flu viruses are thought to be spread mostly through close contact among pigs and possibly from contaminated objects moving between infected and uninfected pigs.

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第一种方式是在下蛋的母鸡已被感染，因而鸡蛋也被感染。

One, by passing from an infected hen to its egg when laid.

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