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13 Cards in this Set
- Front
- Back
Family of Trichinella spiralis
common name? |
Trichinellidae
pork worms |
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Common hosts of Trichinella spiralis
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URBAN/SYLVANIC
Humans; human can be both intermediate and final host....live in the small intestine and four molting stages, juvenile finds a cell and lives there and causes hypertrophied nurse cell Domestic/urban pigs rats and sylvatic: (temperate) foxes, (torrid) hyenas/scavengers, (frigid) polar bears (T. nativa is freezing resistant) |
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Disease caused by Trichinella spiralis
name and key features |
Trichinosis
Rx by tissue biopsy, no treatment |
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Morphology Trichinella spiralis
key features (female pictured) |
Threadlike worm; stichosome esophagus (same as Trichuris trichura)
Single ovary or testis No spicule but can have a spicule sheath that can act as a spicule females significantly larger males: copulatory papilla on each side of terminal anus/cloaca |
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Trichinella spiralis: Briefly described life cycle
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Swine eats infected garbage, eggs get in the gut, once freed, the juvenile goes through the small intestine, reach sexual maturity in 2-3 days, females fertilize eggs inside them and exit the female as juveniles, they travel through cardiac and pulmonary tracts and eventually exit the capillaries and enter the skeletal muscles, increase in size and coil and form a cyst and cause degeneration of muscles
(male pictured) |
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Trichinella spiralis fun facts:
size of interest? |
Smallest nematodes that infect humans but,
world's largest intracellular parasites. |
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Family of Trichuris trichura
common name of this worm family? |
Trichuridae
the whipworms. they look like a whip. derp. |
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Common hosts of Trichuris trichura
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Human; gut mucosa and lives in the lumen (empty middle part) of the gut
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Disease caused by Trichuris trichura
Climate of prevalence? how is it contracted? |
Trichuriasis
warm, wet, shady. SE of US. Geophagy, nightsoil infecting plants. eggs can live years in soil. 2ndary problem: holes in gut cause other infections rectal prolapse, anemia Used as treatment for Krohn's disease. |
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Trichuris trichura: general morphology
distinctive features (2) males vs fem? |
no lips but tiny spear
bacillary band on ventral side of esophageal region males & females similar size, fem slightly larger anterior end thin, thread-like, embeds in gut to feed stichosome esophagus (just like Trichinella spiralis) |
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Trichuris trichura: male morphology
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Testis begin near the posterior end, extends to esophagointestinal juncture where its coils back to become the ejaculatory duct.
Single spicule that has a bulb |
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Trichuris trichura: female morphology
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Ovary begins in the middle of the body and extending posterior of the body, bends forwards and quickly expands to form a narrow oviduct that opens tot he uterus, narrows to a vagina located near the posterior end of the stichosome
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Trichuris trichura life cycle
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Direct life cycle: eggs hatch in the alimentary canals of the host and juvenile reach the cecum & mature in a month
Some eggs defecated; eggs survive in soil for several years. females produce LOADS of eggs. 3-20k/day |