You searched for: “pathogen
pathogen (s) (noun), pathogens (pl)
Any disease-producing micro-organism, such as a bacteria or a virus: During the past winter many people were affected by a pathogen resulting in very bad colds or the flu, and even those who had their doctors give them flu vaccinations came down with bad cases of influenza!

Pathogens proceed to establish themselves, multiply, and produce various symptoms in their hosts.

Any micro-organism or virus which can cause an illness.
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Word Entries at Get Words: “pathogen
Any micro-organism or virus that can cause a disease. (1)