病菌会侵入机体。
由于癌细胞本身不是外部侵入的病菌，而是人体自身的问题细胞，因此免疫系统很难对癌细胞识别和清除。
The immune system has a hard time recognizing and fighting cancer because the enemy is not an invading germ but our own cells gone rogue.
今天，有50多万人受到雅司病感染。 雅司病是由螺杆菌引起，病菌通过患者皮肤上的伤口侵入，导致肿块，溃破后形成溃疡，遍布患者身体。
Today, more than 500 000 are afflicted by yaws, which is caused by a spiral bacteria that penetrates through a cut in the skin resulting in bumps that burst, ulcerate and spread over the body.
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