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30 Cards in this Set
- Front
- Back
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What are the three pathogenic species that cause Schistosomiasis?
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Schistosoma mansoni
S. haematobium S. japonicum |
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What is the required intermediate host in Schistosomiasis?
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Snails
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When I say snails, you say...
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Schistosomaisis!
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What form of the organism develops in the snail?
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Cercaria
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What is the route of infection for Schistosomiasis?
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Penetration of the skin
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How does Schistosomiasis cause tissue damage?
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Eggs of the parasite lodge in tissues/small vessels and cause circulation problems and inflammatory response.
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Are Schistosomes hermaphroditic, do they separate adult sexes?
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Separate - adults live in copulo in human host.
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What is required of the human host to complete the Schistosome life cycle?
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Disposal of human waste into snail pond.
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In the human host, where are each species found?
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Bowel lumen: S. mansoni and japonicum
Bladder lumen: S. haemotobium |
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What organ dysfunction is common with Schistosomiasis?
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Hepatosplenomegaly (granuloma and Pipestem Fibrosis)
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What class of organisms causes eosinophilia?
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Worm/Helminth infections
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How is Schistosomiasis diagnosed?
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1) Eosinophilia
2) Ova in urine or stool |
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What causes swimmer's itch?
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Schistosome Dermatitis - a non-human schistosome cercariae (usualy fowl) burrows into human host, inflammatory response causes pruritic rash
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When I say Lung Fluke, you say....
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Paragonimiasis
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Who is the definitive host in Paragonimiasis?
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Humans, dogs, pigs, rats. (Intermediate Host is a snail or crayfish.)
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How are Paragonimiasis eggs passed from the definitive host?
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Adults live in DH's lungs, eggs are coughed up and swallowed, then excreted.
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How is Paragonimiasis contracted?
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Consumption of metacercariae-containing crabs or crayfish.
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What's the common name for Paragonimus westermani infection?
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Lung Fluke Infection. Sx is hemoptysis, lung abscess, persistent pulmonary infiltrates.
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How is Paragonimiasis diagnosed?
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Eosinophilia, CXR, eggs in sputum
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When I say Clonorchis, you say...
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Liver Fluke!
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How is Clonorchiasis contracted?
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Consumption of metacercariae-containing fish.
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What is required of humans to complete the Clonochis life cycle?
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Contamination of fresh water with human excrement.
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What are the clinical signs of Clonorchiasis?
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Eosinophilia, hepatomegaly, jaundice
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How is Clonorchiasis diagnosed?
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Eggs in bile or feces.
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Is Clonochis the only liver fluke?
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No! Fasciola hepatica is a liver fluke as well.
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When I say WATERCRESS, you say...
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Fasciola hepatica!
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What species is infamous for hosting Fasciola?
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Sheep
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When I say WATER CHESTNUT, you say...
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Fasciolopsis buski!
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What species is the definitive host for Fasciolopiasis?
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Pigs are the major definitive host.
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Are snails required for all trematode lifecycles?
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Yes, for all human pathogens of interest.
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