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Pests

A general term for organisms which may cause illness or damage to humans or to crops, livestock, or materials important to humans. [NALT]

An animal, plant, fungus or other organism that thrives in places where it is not wanted by people, for example in fields, with livestock, in forests or in gardens. [AGROVOC]

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Household and Structural Pests

Pest species that are found in households, such as roaches, fleas, bed bugs, rats, mice, etc.

Parasites

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]

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