what is the sheep liver fluke? parasitic infection caused by two species fasciola hepatica...
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What is the Sheep Liver Fluke?Parasitic infection caused by two species
• Fasciola hepatica• Fasciola gigantica
Larval flukes that migrate through the intestinal wall, abdominal cavity, liver tissue and into bile ducts where they produce eggs
Eukaryotic
Kingdom: Animalia
Phylum: Platyhelminthes (Flatworms)
Class: Trematoda (Flukes)
Order: Echinostomida (Bile Ducts)
Four Phases of InfectionIncubation phase – ingestion to first symptom signs
Acute phase – fever, vomiting, abdominal pain, rash, Anemia, Jaundice
Latent phase – months or year
Chronic phase – develop months to years after infection
- inflammation of liver, gallbladder, and pancreas, biliary obstruction can lead to fibrosis and cirrhosis
30 mm by 13 mm
Mammalian and Aquatic Life Cycle
Assessing the Parasite
Mature Flukes do not produce eggs until about 4 months after infection
Development of blood tests - ELISA
CT scans for burrows from the worms
Treatment Protocols Triclabendazole – 1 to 2 doses in 24 hour period
Bithionol – 5 to 10 dose course
Moving ForwardStrict control of the sale of watercress and other water plants
Thoroughly cook vegetables and avoid contaminated water
Pesticides against host snails
Chemotherapy to decrease animal reservoir
First Appearance
First discovered by a French man in 1379 in his sheep
Eggs have been discovered in mummies
A Widespread Distribution
Over 75 countries – none free from risk
South American highlands
Highly endemic areas – prevalent in school age children
Hypo-endemic pattern – climate dependent
A New Drug: Oxfendazole
http://www.stanford.edu/class/humbio103/ParaSites2001/fascioliasis/Fasciola.htm
http://www.cdc.gov/parasites/fasciola/
http://www.bvgh.org/Biopharmaceutical-Solutions/Global-Health-Primer/Diseases/cid/ViewDetails/ItemID/23.aspx
http://www.who.int/foodborne_trematode_infections/fascioliasis/fascioliasis_epidemiology/en/
http://en.wikipedia.org/wiki/Fasciola_hepatica