pathogen|pathogens

这种病原体可以通过受污染的水传播。

This ___pathogen can spread through contaminated water.

医生们正在研究这些病原体是如何在人与人之间传播的。

Doctors are studying how these ___pathogens spread from person to person.

科学家正在研究如何快速识别这种新型病原体。

Scientists are studying how to quickly identify this new ___pathogen.