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Wild meat is more likely to contain the parasite. [7] [8] In North America this is most often bear, but infection can also occur from pork, boar, and dog meat. [9] Several species of Trichinella can cause disease, with T. spiralis being the most common. [1] After the infected meat has been eaten, the larvae are released from their cysts in the ...
Trichinella spiralis is a viviparous [1] nematode parasite, occurring in rodents, pigs, bears, hyenas and humans, and is responsible for the disease trichinosis. It is sometimes referred to as the "pork worm" due to it being typically encountered in undercooked pork products. It should not be confused with the distantly related pork tapeworm.
Trichinella species can infect swine, wild omnivores (foxes, wolves, bears, skunk, raccoons, rats, and other small mammals), and humans. In swine, the prevalence varies from country to country, and regionally. Long-standing meat inspection programs in some European countries have drastically lowered prevalence rates among domestic swine.
Bears are parasitized by eighty species of parasites, including single-celled protozoans and gastro-intestinal worms, and nematodes and flukes in their heart, liver, lungs and bloodstream. Externally, they have ticks, fleas and lice.
In Northern Europe T. nativa is a species commonly found in omnivores and carnivores such as wild boars, foxes, raccoon dogs and bears. [1] [2] This nematode infects the muscles of mammals such as the Arctic fox and the polar bear. To complete its lifecycle, the flesh of its host must be eaten by some other mammal.
Mange (/ ˈ m eɪ n dʒ /) is a type of skin disease caused by parasitic mites. [1] Because various species of mites also infect plants, birds and reptiles, the term "mange", or colloquially "the mange", suggesting poor condition of the skin and fur due to the infection, is sometimes reserved for pathological mite-infestation of nonhuman mammals.
Cestodes are parasites of vertebrates, with each species infecting a single definitive host or group of closely related host species. All but amphilinids and gyrocotylids (which burrow through the gut or body wall to reach the coelom [ 6 ] ) are intestinal, though some life cycle stages rest in muscle or other tissues.
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. [1] The entomologist E. O. Wilson characterised parasites as "predators that eat prey in units of less than one". [2]