How many hosts do trematodes usually have?
3
What is the standard lifecyle of trematodes?
eggs->miricidium->snail (sporocyts->redia->cercariae)->fish (metacercariae)-> mammals
What are the two types of rediae?
Soldier and reproductive. Soldiers have pharynx and eat invaders so only one fluke is in the snail
Schistosomes
blood flukes
eggs primary pathology
eggs have spines and get trapped in bladder, calcify and swell
snail intermediate host, cercaria enter human skin directly when bathing
Schistosoma mansoni
portal vein of liver
Africa
Humans and monkeys
protein passport
causes intesinal schistosomaisis
Horizontal spine
Schistosoma japonica
Eggs go wherever the blood takes it (no spine)
Causes schistosomaisis japonicum (worse symptoms)
Inapparent spine
Schistosoma haemotobium
Adults go to bladder
urogenital schistosomiasis
eggs damage tissue of bladder
leads to calcified bladder
Terminal spine
Fasciola hepatica
Sheep Liver fluke
Fascioliasis disease
egg->miricidium->Snail->Cercaria->Watercress (metacercaria)->mammal
humans get it from uncooked watercress
Adults live in bile ducts and liver tissue
Eats and grows our liver tissue to eat again
Paragonimus
Lung fluke
Paragonomiasis disease
ingesting raw crustaceans
egg->miricidium->snail->cercaria->crustacean->metacercaria->mammal
adults live in pairs on lungs as cysts
nanophyetus salmincola
fluke gotten from salmon
snail->salmonoid->human
Not too bad symptoms in humans, bad for dogs due to bacteria
Echinostoma
Intestinal fluke
Echinostomiasis disease
eggs->snail->snail/frog->rat/duck/human
Clonorchis sinensis
Adults live in bile duct
undercooked fish
Clonorchiasis disease
Southeast Asia
snail->freshwater fish->mammal
