Infestation <!-- google_ad_client = "ca-pub-2327677141881672"; /* Short title Links */ google_ad_slot = "3055805829"; google_ad_width = 468; google_ad_height = 15; //-->

An infestation is the presence of a large number of pest organisms in a given area such as on the surface of a host e.g. an infestation of fleas on a dog, with the dog playing host.