(from https://en.wikipedia.org/)
". . . Infestation is the state of being invaded or overrun by pests or parasites. It can also refer to the actual organisms living on or within a host.
Terminology
In general, the term "infestation" refers to parasitic diseases caused by animals such as arthropods (i.e. mites, ticks, and lice) and worms, but excluding those caused by protozoa, fungi, and bacteria.
External and internal
Infestations can be classified as either external or internal with regards to the parasites' location in relation to the host. External or ectoparasitic infestation is a condition in which organisms live primarily on the surface of the host (though porocephaliasis can penetrate viscerally) and includes those involving mites, ticks, head lice and bed bugs. An internal (or endoparasitic) infestation is a condition in which organisms live within the host and includes those involving worms (though swimmer's itch stays near the surface). Medically, the term "infestation" is often reserved only for external ectoparasitic infestations while the term infection refers to internal endoparasitic conditions. . . A pest is "a plant or animal detrimental to humans or human concerns (as agriculture or livestock production)"; alternative meanings include organisms that cause nuisance and epidemic disease associated with high mortality (specifically: plague). In its broadest sense, a pest is a competitor of humanity. . . The varied carpet beetle (Anthrenus verbasci) is a 3 mm-long beetle belonging to the family Dermestidae. . .This beetle in larval form is common in houses where it usually does little or no noticeable harm, but it is a feared pest in natural history museums, where it can seriously damage biological specimens. While adults are pollen grazers, larvae feed on natural fibers and can damage carpets, furniture, clothing and insect collections. As the beetles are extremely common in gardens in the summer it is impossible to eradicate them completely from a normal home. Regular vacuuming will keep their numbers down. . ."
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