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caraphernaliaa
A pathogen is a bacteria, virus, protist or fungus that can spread and infect and cause disease. It makes you ill basically. Hope this helps :)
msmerida

Pathogen. A pathogen or infectious agent is a biological agent that causes disease or illness to its host. The term 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.

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