Term
| General characteristics of Trematodes |
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Definition
>flat body with syncytial tegument
>no cilia
>oral sucker, sometimes ventral sucker
>complex life cycles with 1-2 intermediate hosts
>1st host is always a mollusk
>hermaphrodites |
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Term
| During what stages of a trematodes life cycle do humans become infected? |
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Definition
Cercaria
Metacercaria
Adult |
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Term
Clonorchis sinensis
Opisthorchis sinensis |
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Definition
"Chinese liver fluke"
>Sx=diarrhea, edema, pain, hepatitis, hepatomegaly, jaundice, ascites, death
>Dx=detect eggs in feces
>Hx=eat raw fish |
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Term
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Definition
"sheep liver fluke"
sheep, cattle, men.
>Sx=damage to liver as juveniles, migrates ectopically
>Dx=eggs in feces
>Hx=eating plants infected with metacercaria |
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Term
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Definition
"Intestinal fluke"
Pigs and men
>Sx=hemorrhage and abscess of small intestine
>Dx=eggs in feces
>Hx=eating vegetation or pork infected with metacercaria |
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Term
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Definition
"lung fluke"
carnivores, pigs, rodents, man
>Sx=Hemoptysis, chronic cough, secondary bacteria infection; due to adults living in fibrosis in lungs
>Dx=detection of eggs in brown streaks of sputum, radiological
>Hx=eating raw crabs or crustaceans which have the metacercaria |
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Term
| Name the non Schistosome flukes |
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Definition
> Clorochis sinensis
>Fascioloa hepatica
>Fasciolopsis buski
>Paragonimus westermani |
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Term
Schistosomiasis mansoni and japonicum
(egg morphology, disease, locations) |
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Definition
"snail fever" bilharzia
S.mansoni
>adult has 8 testes
>location: GI with spines to get through inferior mesentereic veins and deposit eggs into poop
S.japonicum
>location: GI with spines to get through inferior mesentereic veins and deposit eggs into poop
>spines small so has 10x higher egg production
Disease=Katayama fever in acute. Granulomas around eggs in liver which block hepatic flow, ascites, GI hemorrhage |
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Term
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Definition
adult has 4-5 testes
>location: venous plexuses around bladder
>eggs: conspicuous terminal spine
>intermediate host: Bulinus truncatus
>pathology: eggs cause calcification of bladder wall=hydronephrosis, SQUAMOUS cell carcinoma |
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Term
| Characteristics of Schistosomes |
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Definition
blood parasites
dioecious=male and females separated
direct penetration of host
no metacercarial stage
no operculate (shell) eggs
furcocercous cercaria (forked cercaria) |
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Term
| Schistosome clinical manifestations |
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Definition
1)dermatitis at site of cercaria penetration
2)Katayama fever (HA, wt loss, cough)
3)chronic fibrosis from eggs spreading systemically. |
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