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19 Cards in this Set
- Front
- Back
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Life cycle of Fasciola hepatica?
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human ingests aquatic plant w/metacercariae
excyst in duodenum, reproduce; human poops eggs into H2O --> miracidia --> snail --> free swimming cercariae --> metacercariae on aquatic plant. |
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Life cycle of Fasciolopsis buski?
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same as F. hepatica but definitive host may be pig instead of sheep.
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Difference between F. hepatica and F. buski adults?
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F. buski is larger (up to 75mm) and occurs in pigs
F. heptaica up to 30mm and occurs in sheep livers |
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Which trematodes have two intermediate hosts? What are the species and their hosts?
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Chlonorchis sinensis: snail, freshwater fish
Paragonimus westermani: snail, freshwater crustacean |
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Where does Fasciola hepatica prefer to infect?
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liver. metacercariae migrate from intestine --> bile duct
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Where is Fasciola hepatica endemic?
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Europe, Middle East, Asia
places they eat watercress |
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How to distinguish between Fasciola hepatica, Paragonimus westermani, and Diphyllobotrium latum ova?
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SIZE!
F. hepatica (140um) > P. westermani (90um) > D. latum (70um) D. latum thinner walls F. hepatica walls more irregular |
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Where is Paragonimus westermani endemic?
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SE Asia, Japan
places they eat raw crustaceans |
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Preferred target of Schistosoma mansoni?
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lower digestive tract
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Preferred target of Schistosoma hematobium?
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bladder
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Preferred target of Schistosoma japonicum?
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upper digestive tract
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Rank the trematodes in order of size.
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Fasciolopsis buski > Fasciola hepatica > Chlonorchis sinensis > Paragonimus westermani
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Geographic distribution of S. mansoni?
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Slave trade!
West Africa, Gold/Ivory Coast, South America (BRAZIL), Carribean |
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Geographic distribution of S. hematobium?
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Africa, Middle east
Portugal/Spain due to large Muslim population from Middle East |
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Geographic distribution of S. japonicum?
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Southeast Asia
Hyper-endemic in Philippines |
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Hepatic Portal Pipestem Fibrosis is characteristic of invasion by which trematode?
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S. japonicum (S. mansoni also)
worm resides in blood; lays eggs --> go to intestine OR to liver --> cirrhosis! |
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Symptoms of infection by Schistosoma japonicum?
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hepato and splenomegaly
abdominal edema due to liver cirrhosis emaciation due to loss of metabolic regulation (liver) |
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How to dx infection by Schistosoma spp.?
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S. mansoni & japonicum: ova in feces, mucosal scrapings, ulcer detected by colonoscopy
S. hematobium: ova in URINE at 1PM |
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When is the best time to collect urine from a suspected Schistosomiasis patient?
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1:00 PM
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