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Cestodes, Trematodes, Protozoans
Terms in this set (57)
Taenia Hydatigena definitive hosts
Canine, Wolves, Coyotes, Lynx, rarely feline
Taenia Pisiformis hosts
Canine, feline, foxes, wolves, coyotes, lynx
Dipylidium Caninum hosts
Canine, feline, coyotes, wolves, foxes
Taenia Ovis hosts
Echinococcus granulosus hosts
Canine, wolf, coyote, possibly the fox, ovis, bovine, porcine, rodents, and deer
Echinococcus multilocularis hosts
Canine, feline, fox (arctic, grey or red), rodents, coyote, wolf, vole, lemming, and shrew
taenia taeniaeformis hosts
feline, canine, lynx, and wolf
Cestodes are not zoonotic. True or False?
What describes the general morphology of cestode proglottids?
They are connected to the scolex,, have muscles which enable them to move, may contain eggs and contaminate vegetation
What does the dipylidum caninum egg look like?
Oval in shape containing a hexacanth embryo that have packets of eggs
What does the Taenia spp. and Echinococcus spp. eggs look like?
Characteristic thick shell wall with radial striations that is brown in color and contain a hexacanth embryo
What is the first dour life cycle stages of cestodes?
Eggs are shed in the stool containing a metacestode, then they are ingested by the intermediate host and develop into the second stage larvae within the intermediate host, next the definitive host becomes infected by the ingestion of the intermediate host and finally upon ingestion of the intermediate host by the definitive host most of the infected larvae are digested away leaving only the scolex behind.
Transmission route for Taenia spp.
Indirect---> carnivores acquire infections through ingestion of metacestodes (hyatids) in the tissues of intermediate hosts
Transmission route for Dipylidium caninum
Indirect---> animals acquire infection through the ingestion of larval cysticercoids contained in fleas, less frequently in chewing lice or grain mites
Transmission route for Echinococcus spp.
Direct---> Animals become infected through ingestion of infected eggs.
Indirect——> carnivores acquire infections through Ingestion of metacestodes in the tissues of intermediate hosts
Dipylidium caninum prepatent periods?
Taenia pisiformis prepatent period?
Echinococcus prepatent period?
Taenia Taeniaeformis prepatent period?
Echinococcus multilocularis prepatent period?
What is the most common route of diagnosis for cestodes?
Finding the proglottids around the hosts anal region and hocks.
Describe how a Dipylidium caninum parasitic egg would appear?
Eggs are ocal in shape and occur in packets that are contained with a thin walled membrane.
What best describes how a Taenia spp. parasitic egg would appear?
Eggs have a characteristic thick shell wall with radial striations that is brown in color and contain a hexacanth embryo
What best describes how a Echinococcus spp. parasitic egg would appear?
Eggs have a thick shell wall with radial striations.
Fasciola hepatica hosts
Ruminants, Herbivorous mammals and humans
Canines and felines
Cryptosporidium spp hosts
Canines, felines, ruminants, avians, guinea pigs, snakes and mice
Sarcocystis spp. Hosts
Canines and felines
Toxoplasma gondii hosts
Giardia spp hosts
Canines, felines, equines, ruminants, swine, mice, amphibians and avians
Fascioloides magna hosts
White tailed deer
All protozoans are zoonotic. True or false?
Fasciola hepatica prepatent period
Cystoisospora canis; ohioensis; burrowsi prepatent period
1-2 weeks (7-14 days)
Cryptosporidium spp prepatent period
Sarcocystis spp prepatent period
Fascioloides magna prepatent period
Toxoplasma gondii prepatent period
Heterobilharzia americana prepatent period
Giardia prepatent period
What does the toxoplasma gondii egg look like?
Oocysts are small, spherical-shaped, with clear smooth cyst walls and a single round sporoblast
What does the cryptosporidium spp egg look like?
Eggs are colorless, small and transparent which lie directly below the cover slip
What does the the giardia spp egg look like?
Motile trophozoites are pear shaped and dorsoventrally flattened with four pairs of flagella, two nuclei and a prominent adhesive disc
What does the cystoisospora spp. Egg look like?
Oocyst are small with clear cyst walls, elliptical in shape containing a single, round cell when freshly passed in stool
What does the sarcocystis spp egg look like?
Sporocyts are small, ellipsoidal and contain 4 sporozoites within each sporocyst
Clinical signs of toxoplasma gondii
Presentation is asymptomatic or a fever, coughing, dyspnea, jaundice, anorexic, young animal with possible CNS dysfunction
Clinical signs of sarcocystis spp
Carnivorous hosts will present without any clinical signs as it typically nonpathogenic in them
Clinical signs of giardia spp
Presentation is asymptomatic or diarrhea within 5 days of infection that appears pale, greasy and a foul odor that may be acute, chronic or intermittent in nature
Cystoisospora spp. Clinical signs
These animals are asymptomatic with abdominal pain, weight loss and anorexia, persistent diarrhea that is gray, gaseous and odiferous which will persist into bloody diarrhea, anemia and possibly death
Cryptosporidium spp clinical signs
Animals present asymptomatically or with a chronic diarrhea in dogs but rarely cats
Fasciola spp clinical signs
Hepatic fibrosis, intestinal upset, hepatitis and abdominal pain are presented upon an acute infection while anorexia, anemia, hypoproteinemia, SQ swelling and emaciation are presented
Cryptosporidium spp life cycle
Oocysts are passed in the feces, here they will reside until the definitive host ingests them only to have them release sporozoites, these will multiply into merpzoites to complete their life cycle
Giardia spp life cycle
Trophozoites usually form into cysts before being shed in the feces, the definitive hosts ingests these cysts from the environment where the wall is digested away and two trophozoites are released, finally they begin multiplying only to begin shedding cysts
Fasciola spp life cycle
Fertile eggs are passed out the intestinal tract and carried to water, next within the egg develops a ciliated miracidium that finds a snail only to change to the next cycle, upon exit of the snail it submerges upon vegetation to which is eaten by the definitive host for final maturation
Toxoplasma gondii life cycle
An oocyst is passed in the feces that is non infective, upon sporulation two sporocysts are released each containing four sporozoites that are ingested by the definitive host, next the sporocysts rupture and release the sporozoites that begin multiplying and infecting the intestines and lymph nodes while multiplying stages, finally they migrate to the muscles and liver to reside for the life of the host and begin sporulating oocysts
Is Giardia zoonotic?
Paragonumus Kellicotti prepatent period
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