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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.
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 ...
Bear taxon names such as Arctoidea and Helarctos come from the ancient Greek ἄρκτος (arktos), meaning bear, [7] as do the names "arctic" and "antarctic", via the name of the constellation Ursa Major, the "Great Bear", prominent in the northern sky. [8] Bear taxon names such as Ursidae and Ursus come from Latin Ursus/Ursa, he-bear/she ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 19 January 2025. Relationship between species where one organism lives on or in another organism, causing it harm "Parasite" redirects here. For other uses, see Parasite (disambiguation). A fish parasite, the isopod Cymothoa exigua, replacing the tongue of a Lithognathus Parasitism is a close ...
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.
Similar to the wild chimpanzees, Alaskan brown bears will swallow whole Carex leaves in the springtime to ensure the complete expulsion of parasites during their hibernation. [17] Specifically, as tapeworms thrive off previously digested nutrients in the gut, the rough Carex leaves will lacerate their scolices, facilitating the defecation process.
Cestoda is a class of parasitic worms in the flatworm phylum (Platyhelminthes). Most of the species—and the best-known—are those in the subclass Eucestoda; they are ribbon-like worms as adults, commonly known as tapeworms.
Bear habitats are generally forests, though some species can be found in grassland and savana regions, and the polar bear lives in arctic and aquatic habitats. Most bears are 1.2–2 m (4–7 ft) long, plus a 3–20 cm (1–8 in) tail, though the polar bear is 2.2–2.44 m (7–8 ft) long, and some subspecies of brown bear can be up to 2.8 m (9 ...