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Describe organisms in the Phylum Platyhelminthes. Flatworms; Noncylindrical; Leaf-shaped or ribbon-like organisms; Multiple hosts and complicated life cycles
What organisms are found in the Class Trematoda? Clonorchis sinensis and Schistosoma
What organisms are found in the Class Cestoda? Taenia saginata, Taenia solium, Echinococcus granulosis
What are the general characteristics of Trematoda? Leaf-shaped parasites; Simple digestive tract; At least one intermediate molluscan host (snail)
What are the general characteristics of Cestoda? Lack a digestive tract of their own; Rely completely on the digestion of the host they inhabit
Monoecious both sexes occur in a single animal
Dioecious the male and female are separate animals
What is the common name for Clonorchis sinensis? Chinese liver fluke
How does one get infected with Clonorchis sinensis? Eating raw or undercooked infected fish
What serves as the intermediate host for Clonorchis sinensis? snail
What organism is commonly called the “blood fluke”? Schistosoma
How do people get infected with Schistosoma? Infected by parasite burrowing directly through unbroken skin while wading, washing clothes, swimming or bathing in infected water
Schistosoma causes a pandemic infection. Why don’t we have problems with this fluke in the United States? U.S. lacks a suitable host snail
What is swimmer’s itch? Painful, itchy inflammatory dermatitis; caused by Schistosoma that usually infects birds
What is a scolex? Head of worm
What is a proglottid? Segment of worm
Why is it important to make sure the scolex, as well as the proglottid of the tapeworm, is passed from the body when you are trying to rid a patient of a tapeworm? A scolex can grow new proglottids if it is still attached to the host
What is the definition of a definitive host? Host where we find the adult organism/host where sexual reproduction occurs
What is the definition of an intermediate host? Hosts where asexual reproduction occurs and where we find developing forms of the parasite
Man is the definitive host for both Taenia saginata and Taenia solium. What animal serves as the intermediate host for each tapeworm? T. saginata—cows; T. solium—pigs
How does man become infected with Taenia saginata and Taenia solium? Consuming raw or undercooked beef or pork
What is the difference between the scolex of Taenia saginata and Taenia solium? T. solium—hooks; T. saginata—no hooks
Why is Taenia solium usually considered the more dangerous of the two tapeworms? Because if humans ingest T. solium ova, they can become the host of the larval form; The cystercerci that develop have a predilection for human central nervous system where they may cause brain cysts to develop
How do you prevent infection with Taenia? Thoroughly cook pork and beef
What is the genus and species name of the dog tapeworm? Echinococcus granulosis
Is man the definitive or intermediate host of the dog tapeworm? intermediate
How does man become infected with Echinococcus granulosis? Ingesting infected dog feces
What is a hydatid cyst? A fluid filled sac that may eventually contain up to four gallons of fluid
What is hydatid sand? Immature scolices
Created by: slarmentrout