The life cycle of Fasciola gigantica is as follows: eggs (transported with feces) → eggs hatch → miracidium → miracidium infect snail. Life ca passes its life cycle in two different hosts. • Definitive hosts- Sheep,goat, cattle or man. Adult worm in the biliary passages of the liver. Keywords: Fasciola gigantica, life history, biological characteristic, The general life cycle of fasciolids is described in the following passage.

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The miracidia that failed to find a snail host died within 24 hr. Author information Article notes Copyright and License information Disclaimer. After several weeks, the eggs hatch, producing a parasite form known as the miracidium, which then infects a snail host.


Cheesbrough, ; Read, Reproduction Sexually mature adults reside and presumably mate in biliary ducts of their mammalian host. The adult flukes Fasciola hepatica: The eggs of F.

At this stage, the eyespots can be seen Fig. DPDx is an education resource designed for health professionals and laboratory scientists.

CDC – DPDx – Fascioliasis

The adult flukes have both sex organs, but fertilization between adult male and female flukes is the most common source of sexual reproduction. On day gigantlca, daughter rediae and young cercariae became fully developed no.


Moreover, the obtained metacercariae gigantics this study developed to adults in mice, other than ruminants and humans. 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.

Fully-developed miracidia then protruded from the eggs by pushing through the operculum of the eggs Fig. The flukes are in the metacercariae stage before becoming sexual adults.

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Cheesbrough, ; Read, Key Reproductive Features sexual asexual fertilization internal Non-embryonic eggs are laid within the mammalian host and are passed through to the intestinal tract where they are expelled in the feces.

Life Cycle Immature eggs are discharged in the biliary ducts and in the stool. The prevalence of F.

The anterior end is cone-shaped, unlike the rounded anterior end of Fasciolopsis buski. Immunization of livestock also adds to the cost of fascioliasis. Inside the snail rediae persist in the digestive gland of the mammal host, known as the hepatopancreas.

Free swimming cercarias are found in the bodies of fresh water that are in close proximity of its definitive host. Description of a new trematode worm Fasciola gigantica. This parasite reduces the amount of meat that a cow will produce when slaughtered, and leaves the gigantiac inedible. On day 10 post incubation, the mature sporocyst transformed to become a young redia, with the visible pharynx and primitive gut, the unique characteristics of the redia no.


A case of human fasciolosis: Life cycle image and information courtesy of DPDx. At this point, the cercariae lost their tails and developed into the metacercarial stage Fig. Active cercariae emerged from the snail and swam freely to search for the substrate for encystment.

Parasitic infections of domestic animals: Giganttica living in the northern part of the Old World. Liver fluke disease fascioliasis: The metacercariae have a double thick wall that consists of an outer and inner cyst, which is 0.

The cyst is white when laid and is almost immediately infective to the definitive host.


The metacercariae excysted to become young adult worms and were then recovered in the intestine on days 3 and 6 PI, until day 9 PI when they were found in the liver of the host. It acts by inhibiting protein synthesis in F. Fasciola hepatica infect various animal species, mostly herbivores. Eggs shed by adults are located in the intestinal track of mammals and also in the wild. In humans, maturation from metacercariae into adult flukes takes approximately 3 to 4 months.