Visceral flukes - Echinostoma revolutum Flashcards
Echinostomes are recognized by their:
circumoral collar of peg-like spines
Echinostoma is one of the most _______ termatodes
common/abundant
They have _____ host specificity
low
Circumoral collar bears __ spines in a ______
37
double circle
Eggs
Only a few in uterus at a time
_____ eggs are passed from the definitive host with ____ and must reach ____ for further developement
Operculated
feces
water
Eggs are _______; it takes ____ for miracidium to develop in water before it hatches and penetrates a snail
non-embryonated
2-5 wk
miracidium
How many sporocyst and radial generations develop in the snail
1 sporocyst
2 redia
Cercaria exit rediae and infect:
mollusks, fish, tadpoles
Then trasform into metacercaria
Any definitive host gets infected
When they eat mollusks or fish
Metacercaria excyst in the ____________
small intestine where they become adults
heavy infections may produce
echinostomiasis
characteristics of echinostomiasis
inflammation and mild ulceration, with diarrhea and abdominal pain, and anemia
Diagnosis:
eggs in feces: dark brown, developing zygotes
Treatment
Praziqunatel