What is the process referred to when parasites infest their host?

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The process of parasites infesting their host is referred to as infestation. This term specifically describes the process in which parasitic organisms, such as worms or ectoparasites like fleas and ticks, take up residence on or within a host organism, often causing harm or disease to the host. Infestation typically implies that the parasites are living on or within the host, relying on the host for survival and reproduction.

In contrast, infection generally refers to the invasion of pathogenic microorganisms, such as bacteria or viruses, that may cause disease but are not specifically categorized as parasites. Symbiosis encompasses a broader range of relationships between organisms, including mutualism, commensalism, and parasitism itself, but does not specifically imply harm to the host. Contamination refers to the presence of unwanted substances or organisms, not necessarily indicating any living relationship or dependence, as is the case with infestation.

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