Trematodes Flashcards
What are the normal IH for trematodes?
Molluscs (snails and slugs)
DH for fasciola hepatica?
Sheep, cattle, goats and other ruminants
IH for Fasciola hepatica?
Aquatic snails
Adult fasciola hepatica site of infection?
Bile ducts
Immature Fasciola hepatica site of infection?
They migrate throughout the liver parenchyma
What stage of Fasciola hepatica does the IH ingest?
Miracidia
What stage of Fasciola hepatica is infective to the DH?
Metacercariae
DH of Fascioloides magna?
Primarily white-tailed deer, also elk, and moose
IH of Fascioloides magna?
Aquatic snails
Adult Fascioloides magna site of infection in DH?
Cysts in the liver parenchyma
Immature Fascioloides magna site of infection in the IH?
They migrate through the liver
Paramphistomum cervi DH?
Domestic and wild ruminants throughout the world
IH of Paramphistomum cervi?
Aquatic snails
What stage of Paramphistomum cervi is infective to the DH?
Metacercariae
DH of Nanophyetus salmincola?
Piscivorous (fish-eating) mammals
IH of Nanophyetus salmincola?
1st: aquatic snail
2nd: Fish
Nanophyetus salmincola adult site of infection?
Small intestine
What stage of Nanophyetus salmincola is ingested by the snail?
Miracidium
What stage of Nanophyetus salmincola is ingested by fish?
Cercaria
DH for Paragonimus kellicotti?
Dogs, cats, wild carnivores
IH for Paragonimus kellicotti?
First = aquatic snail Second = crayfish
DH adult site of infection of Paragonimus kellicotti?
Lung parenchyma
What stage of Paragonimus kellicotti is infective to the snails?
Miracidia
What stage of Paragonimus kellicotti are infective to crayfish?
Cercariae
What stage of Paragonimus kellicotti is infective to DH?
Metacercariae
What is the PPP for Paragonimus kellicotti?
4-5 weeks for dogs
10 weeks for cats
DH for Dicrocoelium dentriticum?
Sheep, cattle, goats, and other mammals
IH for Dicrocoelium dentriticum?
1st = terrestrial snail 2nd = Ant
What is the site of infection of adult Dicrocoelium dentriticum in the DH?
Bile ducts and gall bladder
What stage of Dicrocoelium dentriticum is infective to snails?
Embryonated eggs
What stage of Dicrocoelium dentriticum is infective to ants?
Cercariae
What stage of Dicrocoelium dentriticum is infective to DH?
Metacercariae
What is the PPP for Dicrocoelium dentriticum?
11-12 weeks
DH of Platynosomum illiciens?
Cats, wild mammals and birds
IH of Platynosomum illiciens?
1st = terrestrial snail 2nd = terrestrial isopod (roly polys)
PH of Platynosomum illiciens?
Lizards, et al. reptiles and amphibians
Platynosomum illiciens adult site of infection in the DH?
Gall bladder and bile ducts
What stage of Platynosomum illiciens is infective to snails?
Eggs containing miracidia
What stage of Platynosomum illiciens are infective to the DH?
Metacercariae
PPP of Platynosomum illiciens?
2-3 months
DH of alaria?
dogs, cats, and other carnivores
IH of alaria?
Aquatic snails and tadpoles
PH of alaria?
frogs, snakes, mouse, rats, birds, other small mammals and reptiles
Adult site of infection in the DH for alaria?
Small intestines
Immature fluke site of infection in the IH for alaria?
Immature flukes in the lungs
What stage of alaria is infective to the DH?
Mesocercaria
DH of Heterobilharzia americana?
Dogs, raccoons and bobcats
IH of Heterobilharzia americana?
Aquatic snails
Adult site of infection in DH for Heterobilharzia americana?
Mesenteric veins of large and small intestines
What stage of Heterobilharzia americana is infective to the IH?
Miricidum
What stage of Heterobilharzia americana infects the DH?
Cercariae
What larval stage does Heterobilharzia americana lack?
Metacercariae
What are the two rickettsial agents that trematodes are known vectors for?
Neorickettsia risticii and Neorickettsia helminthoeca