pathogen

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[edit] English

[edit] Etymology

From patho- + -gen.

[edit] Noun

pathogen (plural pathogens)

  1. (pathology, immunology) Any organism or substance, especially a microorganism, capable of causing disease, such as bacteria, viruses, protozoa or fungi. Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease.

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