3. Lecture: TREMATODES: Fasciolosis, infection with common liver fluke

Question 1

hosts of common liver fluke (FASCIOLA HEPATICA) ?

Answer 1

FH: mainly ruminants
IH: mud-snail

Question 2

which hosts develope early resistance and which develope late or no resistance?

Answer 2

early resistance: horse and donkey
sheep and goat do not develope resistant

Question 3

epidemiology: where does parasite localize in final hst, how does transmission to FH occur?

Answer 3

-liver bile ducts
-ingestion of parasite larvae from plants

Question 4

why does life cycle depend on climate and presence of mud snail ?

Answer 4

fluke eggs present in spring due to heavy rainfall- snail population high > CS finally in summer time
larvae is inside snails; spring ingested by sheep

Question 5

on which pastures it is more prevalent?

Answer 5

mainland Britain -summer
western Ireland-winter

Question 6

2 snail infection cycles: summer infection and winter infection?

Answer 6

-development outside final host
-development inside final host

Question 7

development in FH

Answer 7

young flukes migrate in liver parenchyma for 6-8 weeks > prepatent period 2-3 month > complete life cycle takes 3-4 month