Parasites: Platyhelminthes_Trematodes (flukes) Flashcards
gender
hermaphrodites
ova
operculated
live
in the water
larval stage
(motile ciliated) miracidium
intermediate host
aquatic snail
sack
sporocyt
released from sporocyst
multiple redia/rediae
rediae develop into
multiple cercaria
(emerge from snail and swim in water)
route of transmission 1
cercaria penetrate skin of definitive host
travel to predilection site
become adult
route of transmission 2
cercaria attach to vegetation
lose tail
form a cyst
become a metacercaria
ingested in definitive host when feeds on vegetation
travel to predilection site
becomes adult
route of transmission 3
cercaria lose its tail
penetrate skin of 2nd intermediate host
encyst muscle-become metacercaria
ingested in the definitive host in meat of 2nd intermediate host
cyst digested
travels to predilection site
becomes adult
sheep liver fluke/common sheep fluke
Fasciola Hepatica
Fasciola gigantica
ruminants
biliary duct, liver, gallbladder
2nd route: attach to veg-watercress
bottle jaw, anemia, wasting
zoonotic! biliary tract
most economically important-cattle
(lizard poisoning fluke)
Platynosomum fastosum
cats
bile duct/gall bladder
2nd route: lizards
no zoonosis
salmon poisoning fluke
Nanophyetus salmincota
dogs
small intestine
3rd route: salmon
zoonosis: Neorickettsia helminthoeca
lung fluke of dogs and cats
Paragonimus
kellicotti
dogs and cats
lung (parechyma) tissue, adult in small intestine
3rd route: crawfish, snail larval host
zoonosis: rare
intestinal fluke of dog and cat
Alaria Spp.
dogs, cats, wild carnivores
small intestine
3rd route: frog, transmammary in cats, snakes and mice larval stage
zoonosis: rare
