Opisthorchis sinensis Flashcards
Opisthorchis sinesis is not a food-borne zoonosis (T/F)
FALSE!
- Opisthorchis sinesis is a food-borne zoonosis trematode
What are the definitive hosts of Opisthorchis sinesis?
- Humans
- Reptiles
- Birds
- Dogs
What are the intermediate hosts of Opisthorchis sinensis?
- Primary: snail
- Secondary: Fish
Opisthorchis sinensis is also known as what?
Chinese liver fluke
What is the geographical distribution of Opisthorchis sinensis?
- Korea
- China
- Taiwan
- Japan
- Vietnam
Where does high incidence of Opisthorchis sinensis occur?
- Sushi consumption
- fish farms using feces as fertilizer for plant growth
How is Opisthorchis sinensis transmitted?
- To host via eating raw fish with metacercaria,
- to snail by infected feces in water
Describe the life cycle of Opisthorchis sinensis.
- Trematode life cycle
- Cercaria shed by snails infect fish.
- Cercaria in fish become metacercaria which infects definitive hosts when they eat raw fish
- Metacercaria migrate to liver and become adult fluke
What are the clinical symptoms of of Opisthorchis sinensis infection?
- usually asyptomatic
- in heavy infection (6000+ flukes) mechanical and toxic irritation in bile ducts; rarely fatal
What is the treatment for Opisthorchis sinensis infection?
Praziquantel
How does one control O. sinensis infection?
- Prevent fecal contamination of fish ponds
- decrease snail populations
- cook fish
