Trematode Flashcards
(25 cards)
What are trematodes commonly known as?
Flukes
The name fluke comes from the Anglo-Saxon word ‘floe’ meaning flatfish.
What is the classification of trematodes based on habitat?
- Blood flukes
- Tissue flukes
- Liver flukes
- Intestinal flukes
- Lung flukes
What are the two suckers present in flukes?
- Oral sucker
- Ventral sucker
What is the definitive host for Schistosoma haematobium?
Humans
No animal reservoir is known.
What is the intermediate host for Schistosoma haematobium?
Freshwater snails of the genus Bulinus
What is the infective form of Schistosoma haematobium?
Cercaria larva
How do cercariae penetrate the skin?
They lose their tails and become schistosomulae
How long can adult Schistosoma haematobium worms live?
20-30 years
What are the two stages of clinical illness caused by schistosomes?
- Acute
- Chronic
What symptoms may occur during acute schistosomiasis?
- Intense irritation
- Skin rash
- Cough
- Mild fever
What causes painless hematuria in chronic schistosomiasis?
Egg deposition in the urinary bladder
What is the drug of choice for treating schistosomiasis?
Praziquantel
What is a common complication of chronic schistosomiasis?
Urinary bladder carcinoma
What type of dermatitis is associated with cercarial invasion?
Cercarial dermatitis (swimmer’s itch)
What is Katayama Fever?
A serum sickness-like illness occurring after 4-8 weeks of cercarial invasion
What are the laboratory diagnosis methods for Schistosoma mansoni?
- Stool microscopy
- Kato-Katz thick smear
- Rectal biopsy
- Serological diagnosis
- Imaging
- Blood examination
What is the common name for Schistosoma japonicum?
Oriental blood fluke
What is the intermediate host for Schistosoma japonicum?
Amphibian snails of the genus Oncomelania
What characterizes the chronic illness caused by Schistosoma japonicum?
Intestinal mucosal hyperplasia and portal hypertension
What is the pathogenesis of Schistosoma japonicum similar to?
Schistosoma mansoni
What is the primary treatment for Schistosoma japonicum infection?
Praziquantel
Fill in the blank: The unique feature of flukes is the presence of two _______.
suckers
True or False: Schistosoma haematobium is endemic only in Africa.
False
It is also found in other regions like the Nile valley in Egypt.
