Morfología Ciclo vital. Hospedadores Género: Fasciola Filo:Platyhelminthes. Hospedador definitivo. Afecta principalmente a bovinos, ovinos. Fasciola Hepatica Víctor Cortés Sánchez Departamento de Agentes . También fue el primer ciclo explicado: Leuckart ; Thomas Capillaria hepatica is a parasitic nematode which causes hepatic capillariasis in rodents and . Moravec, F (). “Proposal of a . Fasciola hepatica/gigantica.
|Published (Last):||25 September 2009|
|PDF File Size:||2.3 Mb|
|ePub File Size:||12.34 Mb|
|Price:||Free* [*Free Regsitration Required]|
The trematodes Fasciola hepatica the sheep liver fluke and Fasciola giganticaparasites of herbivores that can infect humans accidentally. Immature eggs are discharged in the biplogico ducts and in the stool. Eggs become embryonated in watereggs release miracidiawhich invade a suitable snail intermediate hostincluding the genera Galba, Fossaria and Pseudosuccinea. In the snail the parasites undergo several developmental stages sporocystsrediaeand cercariae.
The cercariae are released from the snail and encyst as metacercariae on aquatic vegetation or other surfaces. Mammals acquire the infection by eating vegetation containing metacercariae.
Humans can become infected by ingesting metacercariae-containing freshwater plants, fascikla watercress. After ingestion, the metacercariae excyst in the duodenum and migrate through the intestinal wall, the peritoneal cavity, and the liver parenchyma into the biliary ducts, where they develop into adults. In humans, maturation from metacercariae into adult flukes takes approximately 3 to 4 months.
The adult flukes Fasciola hepatica: Fasciola hepatica infect various animal species, mostly herbivores. Human infections with F.
During the acute phase caused by the migration of the immature fluke through the hepatic parenchymamanifestations include abdominal pain, hepatomegaly, fever, vomiting, diarrhea, urticaria and eosinophilia, and can last for months. In the chronic phase caused by the adult fluke within the bile ductsthe symptoms are more discrete hepatida reflect intermittent biliary obstruction and inflammation.
Occasionally, ectopic locations of infection such as intestinal wall, lungs, subcutaneous tissue, and pharyngeal mucosa can occur. Image courtesy of Dr. Galba truncatula, the main intermediate host of F. Galba humilis, a host fasciolla F. Fossaria bulamoides, a host for F. Pseudosuccinea columella, a lymnaeid snail that has been introduced into South America and serves as an intermediate host for F. Microscopic identification of eggs is useful in the chronic adult stage. Eggs can biooogico recovered in the stools or in material obtained by duodenal or biliary drainage.
They are morphologically indistinguishable from those of Fasciolopsis buski. False fascioliasis pseudofascioliasis refers to the presence of eggs in the stool resulting not from an actual infection but from recent ingestion of infected livers containing eggs.
This situation with its potential for misdiagnosis can be avoided by having the patient follow a liver-free diet several days before a repeat stool examination. Antibody detection tests are useful especially in the early invasive stages, when the eggs are not yet apparent in the stools, or in biologjco fascioliasis.
The current tests of choice for immunodiagnosis of human Fasciola hepatica infection are enzyme immunoassays EIA fascio,a excretory-secretory ES antigens combined with confirmation of positives by immunoblot.
CDC – Fasciola – Biology
Specific antibodies to Fasciola may be detectable within 2 to 4 weeks after infection, which is 5 to 7 weeks before eggs appear in stool. Antibody levels decrease to normal 6 to 12 months after chemotherapeutic cure and can be used to predict the success of therapy.
CDC has developed an immunoblot assay for fascioliasis based on a recombinant F. Serologic testing for fascioliasis is available at the CDC. Pre-approval is necessary before submitting a specimen for fascioliasis testing.
To obtain approval biplogico contact the Parasitic Diseases Public Inquiries at or at parasites cdc. Shin SH et al.
Morphologic comparison with other intestinal parasites. Treatment information for fascioliasis can be found at: DPDx is an education resource designed for health professionals and laboratory scientists. For an overview including prevention and control visit www. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly nepatica page ciclk Skip directly to site content.
Enter Email Address What’s this? Recommend on Facebook Tweet Share Compartir. Life Cycle Immature eggs are discharged in the biliary ducts and in the stool. Image Gallery Fasciola hepatica eggs.
The eggs are unembryonated when passed in feces. The eggs of F. Adults of Fasciola hepatica are large and broadly-flattened, measuring up to 30 mm long and 15 mm wide. The anterior end is cone-shaped, unlike the rounded anterior end of Fasciolopsis buski.
Adults reside in the bile ducts of the liver in the definitive host. Unstained adult of F.
Adults of Fasciola hepatica observed with endoscopic retrograde cholangiopancreatography ERCP imaging. Intermediate hosts of Fasciola spp. Members of the genus Fasciola require a snail in the family Lymnaeidae to complete their life cycle. The species of snail can vary, in terms of location, habitat and elevation.
In places where both F.
Laboratory Diagnosis Diagnostic Findings Microscopic identification of eggs is useful in the chronic adult stage.
Serological diagnosis of Fasciola hepatica. Parasitol al Dia ; Treatment Information Treatment Information Treatment information for fascioliasis can be found at: Get Email Updates To receive email updates about this page, enter your email address: December 8, Page last updated: December 8, Content source: Linking to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site.