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Microorganisms, viruses and parasites that can cause disease.

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Toxic substance of fungal origin, e.g. aflatoxin. [AGROVOC]


Invertebrate organisms that live on or in another organism (the host), and benefit at the expense of the other. Traditionally excluded from definition of parasites are pathogenic bacteria; fungi; viruses; and plants; though they may live parasitically. [NALT]

An organism that lives at the expense of another (host) during some portion of its life cycle. Usually a parasite does not kill its host. [AGROVOC]


Microscopic infectious agent that can multiply only in living cells of animals, plants, or bacteria, consisting of genetic material, either DNA or RNA, housed inside a capsid.


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