Is Echinococcus granulosus a trematode?
Echinococcus granulosus, also called the hydatid worm, hyper tape-worm or dog tapeworm, is a cyclophyllid cestode that dwells in the small intestine of canids as an adult, but which has important intermediate hosts such as livestock and humans, where it causes cystic echinococcosis, also known as hydatid disease.
Is Echinococcus granulosus a bacteria?
Echinococcus is an infection caused by a parasitic tapeworm from the Echinococcus genus. A few different types of tapeworms can cause echinococcus in humans, including: E. granulosus, E.
How is Echinococcus granulosus transmitted?
Humans can be exposed to these eggs by “hand-to-mouth” transfer or contamination. By ingesting food, water or soil contaminated with stool from infected dogs. This might include grass, herbs, greens, or berries gathered from fields. By petting or handling dogs infected with the Echinococcus granulosus tapeworm.
Is Echinococcus granulosus a roundworm?
symptoms of echinococcosis …by the larval form of Echinococcus granulosus, a tapeworm common in sheep, cattle, camels, dogs, and many other mammals. The disease can develop in humans upon ingestion of the eggs, which may be present in the tissues of infected animals or on food contaminated by their excreta.
What is the difference between Echinococcus granulosus and multilocularis?
Echinococcus granulosus (sensu lato) causes cystic echinococcosis and is the form most frequently encountered. Another species, E. multilocularis, causes alveolar echinococcosis, and is becoming increasingly more common.
Is Echinococcus granulosus zoonotic?
Echinococcosis is a zoonotic disease (transmitted from animals to humans) caused by the larval stage (hydatid cyst) of tapeworms. Eggs are excreted in the faeces of infected dogs and foxes and can be ingested by humans either by close contact with these animals or through contaminated food.
What is the infective stage of Echinococcus granulosus?
The encysted larval (metacestode) stage is known as a bladder-worm or hydatid, and it produces multiple infective stages (protoscoleces, apparent as invaginated scolices already containing suckers and hooks) either directly from the germinal layer of the cyst wall, or by forming brood sacs (hydatid sand) by endogenous …
What disease is caused by Echinococcus granulosus?
Cystic echinocccosis (CE), also known as hydatid disease, is caused by infection with the larval stage of Echinococcus granulosus, a ~2–7 millimeter long tapeworm found in dogs (definitive host) and sheep, cattle, goats, and pigs (intermediate hosts).
How is Echinococcus multilocularis transmitted?
The most common mode of transmission to humans is by the accidental consumption of soil, water, or food that has been contaminated by the fecal matter of an infected dog. Echinococcus eggs that have been deposited in soil can stay viable for up to a year.
What is the vector for Echinococcus granulosus?
While there are no biological or mechanical vectors for the adult or larval form of any Echinococcus species, coprophagic flies, carrion birds and arthropods can act as mechanical vectors for the eggs.
How is Echinococcus granulosus migrates and transfers to the liver?
After ingestion of eggs ofE. granulosus, the eggs hatch and the larval oncospheres pass to the liver by the portal vein. Three-fourths of infected individuals develop one or more hepatic cysts, which grow slowly. The typical hydatid cyst is spherical and may measure up to more than 30 cm in diameter.