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''Fasiola Hepatica'' has a definitive ruminant mammalian host and an intermediate molluscian host. The full life cycle is illustrated in the image aside.
''Fasiola Hepatica'' has a definitive ruminant mammalian host and an intermediate molluscian host. The full life cycle is illustrated in the image aside.
{| {{prettytable}}
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[[Image:Fasciola hepatica.jpg|300px|thumb|right|'''Fasciola hepatica (Copyright Adam Cuerden, Wikimedia Commons) ''']]
[[Image:Fasciola hepatica.jpg|300px|thumb|right|'''Fasciola hepatica (Copyright Adam Cuerden, Wikimedia Commons) ''']]
===Pathogenesis===
The severity of the infection is mainly dependent on the number of metacercariae ingested. The Pathogenesis is often described as two-fold. The first stage occuring when the parasite migrates through the liver parenchyma, causing liver damage and haemorrhage. The second phase occurs when the parasite is in the bile ducts, and damage is a result of the haematophagic activity of the adult flukes.
===Acute Fascioliasis===
The acute disease is a less common type of Fasciola hepatica, and generally occurs 2-6 weeks after large ingestion of metacercariae. The young liver flukes migrate through the liver parenchyma causing severe haemorrhaging, due to the damage to the liver vasculature.
Acute disease associated with immature fluke migration through the [[Liver - Anatomy & Physiology|liver]]
This occurs in late autumn and winter, mainly between the months of August to October.
*severity of outbreaks depend on a number of epidemiological factors
*severity of outbreaks depend on a number of epidemiological factors
*the [[Liver - Anatomy & Physiology|liver]] of animals which die of this disease will be
*the [[Liver - Anatomy & Physiology|liver]] of animals which die of this disease will be