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| Fasciola hepatica | |
|---|---|
| Name | Fasciola hepatica |
| Regnum | Animalia |
| Phylum | Platyhelminthes |
| Classis | Trematoda |
| Ordo | Plagiorchiida |
| Familia | Fasciolidae |
| Genus | Fasciola |
| Species | F. hepatica |
Fasciola hepatica is a parasitic trematode of veterinary and medical importance that infects the livers of mammals including Bos taurus, Ovis aries, and humans, causing fasciolosis. First described in the 19th century during comparative anatomy work linked to institutions such as the Royal Society and collections at the British Museum, it has influenced studies in parasitology, veterinary science, and public health linked to agencies like the World Health Organization and national ministries such as the Ministry of Agriculture, Forestry and Fisheries (Japan).
F. hepatica belongs to the family Fasciolidae within the class Trematoda, historically placed by taxonomists publishing in journals associated with the Linnean Society of London and debated in taxonomic treatments at the Smithsonian Institution. Adult worms are dorsoventrally flattened and leaf-shaped, with a conical anterior and broad posterior resembling specimens illustrated in the collections of the Natural History Museum, London and the Muséum national d'Histoire naturelle. Morphological descriptions use microscopes made by firms such as Zeiss and were standardized in works from the Royal College of Surgeons. Key external features include oral and ventral suckers and a tegument adapted to bile-rich environments, described in comparative anatomy texts used at Harvard Medical School and Johns Hopkins University.
The life cycle involves egg shedding in feces of infected definitive hosts like Bos taurus and Capra aegagrus hircus, embryonation in freshwater influenced by studies from the International Hydrological Programme, and development in freshwater snail intermediate hosts such as species of the genus Lymnaea, studied in malacology collections at the Natural History Museum, Paris. Miracidia infect snails, producing sporocysts, rediae, and cercariae; cercariae encyst as metacercariae on aquatic vegetation such as watercress, a crop cultivated in regions represented by the Food and Agriculture Organization and traded through markets regulated by institutions like the European Commission. Humans acquire infection by ingesting metacercariae on plants, water, or via accidental ingestion implicated in outbreaks recorded by national public health agencies like the Centers for Disease Control and Prevention and the Agence nationale de sécurité sanitaire de l'alimentation, de l'environnement et du travail.
Fasciolosis has been reported across continents studied by investigators affiliated with the London School of Hygiene & Tropical Medicine, the Institut Pasteur, and the Rockefeller Foundation. Endemic regions include parts of Andalusia and Galicia in Spain, highland zones of the Andes Mountains encompassing areas of Peru and Bolivia, and temperate regions in Ireland and Scotland, with surveillance data contributed by the European Centre for Disease Prevention and Control and the Pan American Health Organization. Animal reservoirs in pastoral systems documented by the International Livestock Research Institute and trade movements linked to agreements like the World Trade Organization Sanitary and Phytosanitary measures influence distribution. Climatic and environmental drivers discussed at conferences hosted by the Intergovernmental Panel on Climate Change and the United Nations Environment Programme affect snail habitats and transmission seasonality.
In definitive hosts, migrating juveniles penetrate hepatic parenchyma causing necrosis, haemorrhage, and inflammatory responses characterized by eosinophilia noted in case series from hospitals such as Mayo Clinic and Karolinska University Hospital. Chronic biliary infection leads to cholangitis, biliary fibrosis, and obstructive symptoms described in textbooks used at University of Oxford and University of Cambridge. Human clinical presentations range from acute febrile illness with right upper quadrant pain to chronic intermittent biliary colic and anaemia; syndromic management paradigms have been discussed in guidelines from the World Health Organization and national ministries like the Ministry of Health (Brazil).
Diagnosis relies on detection of eggs in stool by microscopy using protocols developed in laboratories at the Robert Koch Institute and serological assays such as ELISA standardized in collaborations involving the Centers for Disease Control and Prevention and the Institut Pasteur de Dakar. Imaging modalities including ultrasound and computed tomography provided by vendors like GE Healthcare and Siemens Healthineers reveal hepatic lesions and biliary dilatation, techniques employed in hospitals such as Addenbrooke's Hospital and Mayo Clinic Hospital. Molecular methods including PCR targeting ribosomal and mitochondrial markers were validated in research consortia involving the Wellcome Trust and the European Molecular Biology Laboratory.
Anthelmintic therapy centers on drugs such as triclabendazole, whose clinical efficacy was tested in randomized trials overseen by regulatory authorities like the European Medicines Agency and the U.S. Food and Drug Administration, with alternative agents evaluated in trials at institutions such as University College London. Veterinary control integrates strategic anthelmintic dosing, grazing management, and snail habitat modification advised by advisory bodies like the Food and Agriculture Organization and national extension services such as those run by the Department of Agriculture (United States). Integrated One Health approaches have been promoted in initiatives involving the World Health Organization, the World Organisation for Animal Health, and the Food and Agriculture Organization.
Prevention includes safe food and water practices championed by campaigns from the World Health Organization and the Centers for Disease Control and Prevention, education programs run by national ministries like the Ministry of Health and Family Welfare (India), and community interventions modeled on successful programs in Bolivia and Peru supported by the Pan American Health Organization. Environmental management to reduce snail populations, agricultural policy changes influenced by the European Commission, and surveillance integrated into systems operated by the Global Health Security Agenda and the World Health Organization underpin control. Research funding from organizations such as the Wellcome Trust and the Bill & Melinda Gates Foundation continues to support vaccine and diagnostic development in collaborative networks including the International Livestock Research Institute and university partners like University of Glasgow.
Category:Parasitic helminths