Trematode Flashcards
What are the blood trematodes?
Schistosoma haematobium, Schistosoma mansoni, Schistosoma japonicum
Where does Schistosoma haematobium reside?
Vesical venous plexus
Where do Schistosoma mansoni and Schistosoma japonicum reside?
Rectal venous plexus and portal venous plexus
What causes schistosomiasis?
Trematode flatworms of the genus Schistosoma
What are the two main forms of schistosomiasis?
Urinary schistosomiasis, Intestinal schistosomiasis
Which organs are mainly affected by intestinal schistosomiasis?
Liver, spleen
What manifestations can occur during acute infection from schistosoma?
Cercarial dermatitis, acute schistosomiasis
What is the time frame for acute schistosomiasis symptoms to appear?
2-8 weeks
What happens in long-established schistosomiasis infections?
Adult worms lay eggs causing inflammatory reactions and secrete proteolytic enzymes
What is the role of the proteolytic enzymes secreted by schistosoma eggs?
Help them migrate to the bladder and intestines
Diagnostic stage of schistosomia
Eggs in urine and stool
What do the eggs hatch into under optimal conditions?
Miracidia
What do miracidia do in the life cycle of schistosoma?
Swim and penetrate specific snail intermediate hosts
How many generations of sporocysts are produced in the snail stage?
Two generations
What is produced after the sporocysts in the snail stage?
Cercariae
