Pathogen

A pathogen literally "birth of pain" from the Greek παθογένεια) is a biological agent that can cause disease to its host. A synonym of pathogen is "infectious agent".

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The term "pathogen" is most often used for agents that disrupt the normal physiology of a multicellular animal or plant. However, pathogens can infect unicellular organisms from all of the biological kingdoms (see Viruses, below).

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Greek: The noun Greek refers to:...

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