Visceral flukes - Echinostoma revolutum

Question 1

Echinostomes are recognized by their:

Answer 1

circumoral collar of peg-like spines

Question 2

Echinostoma is one of the most _______ termatodes

Answer 2

common/abundant

Question 3

They have _____ host specificity

Answer 3

low

Question 4

Circumoral collar bears __ spines in a ______

Answer 4

37

double circle

Question 5

Eggs

Answer 5

Only a few in uterus at a time

Question 6

_____ eggs are passed from the definitive host with ____ and must reach ____ for further developement

Answer 6

Operculated
feces
water

Question 7

Eggs are _______; it takes ____ for miracidium to develop in water before it hatches and penetrates a snail

Answer 7

non-embryonated
2-5 wk
miracidium

Question 8

How many sporocyst and radial generations develop in the snail

Answer 8

1 sporocyst

2 redia

Question 9

Cercaria exit rediae and infect:

Answer 9

mollusks, fish, tadpoles

Then trasform into metacercaria

Question 10

Any definitive host gets infected

Answer 10

When they eat mollusks or fish

Question 11

Metacercaria excyst in the ____________

Answer 11

small intestine where they become adults

Question 12

heavy infections may produce

Answer 12

echinostomiasis

Question 13

characteristics of echinostomiasis

Answer 13

inflammation and mild ulceration, with diarrhea and abdominal pain, and anemia

Question 14

Diagnosis:

Answer 14

eggs in feces: dark brown, developing zygotes

Question 15

Treatment

Answer 15

Praziqunatel

Question 16

Prevention and control

Answer 16

Due to large # of primary & secondary hosts, it’s impossible to control it. Infections can be prevented if food is cooked