它可以引起的感染，病毒，细菌或寄生虫。
It can be caused by an infection, virus, bacterium or parasite.
生物致癌物质，例如由某些病毒、细菌或寄生虫引起的感染。
Biological carcinogens, such as infections from certain viruses, bacteria or parasites.
想象一下，假如你是一只小昆虫，因为某些细菌或寄生虫侵入你的身体导致你生病了。
Imagine that you're an insect, and that you've fallen ill because some bacteria or parasites have invaded your body.
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