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Platyhelminthe
| Question | Answer |
|---|---|
| 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
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