What is the life cycle of Echinococcus granulosus?
Echinococcus granulosus, which causes cystic echinococcosis, is a cestode whose life cycle involves dogs and other canids as definitive hosts for the intestinal tapeworm and domestic and wild ungulates as intermediate hosts for the tissue-invading metacestode, which is the larval stage of the tapeworm (Fig. 281.1).
What is the larval stage of Echinococcus granulosus?
Their larval stage, called the hydatid cyst, develops predominantly in the liver and lungs of intermediate hosts. The hydatid cyst is the causative agent of cystic hydatid disease and the species Echinococcus granulosus, G1 haplotype, is responsible for the vast majority of cases in humans, cattle and sheep.
What is pathogenesis of Echinococcus granulosus?
Pathophysiology of Echinococcosis In tissue, E. granulosus oncospheres develop into cysts, which grow slowly (usually over many years) into large unilocular, fluid-filled lesions—hydatid cysts. Brood capsules containing numerous small infective protoscolices form within these cysts.
Who 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).
What is the morphology of Echinococcus granulosus?
Adult E. granulosus worms are small (2-6mm long) and have a scolex with only three attached segments. The scolex has four lateral suckers and the rostellum is non-retractable and armed with a double crown of 28-50 recurved hooks.
How many segments are in Echinococcus granulosus?
The adult tapeworm ranges in length from 3 mm to 6 mm and has three proglottids (“segments”) when intact—an immature proglottid, mature proglottid and a gravid proglottid.
Where is Echinococcus granulosus found?
Symptoms developed depend on location of the cyst, but most occur in the liver, lungs, or both. Echinococcus granulosus was first documented in Alaska but is distributed worldwide. It is especially prevalent in parts of Eurasia, north and east Africa, Australia, and South America.
What is the mode of transmission of Echinococcus spp?
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.
Life Cycle: The adult Echinococcus granulosus (3 to 6 mm long) resides in the small bowel of the definitive hosts, dogs or other canids. Gravid proglottids release eggs that are passed in the feces. After ingestion by a suitable intermediate host (under natural conditions: sheep, goat, swine, cattle, horses, camel),…
Is Echinococcus granulossus a zoonotic disease?
Echinococcus granulossus Echinococcus granulosus, also called dog tape worm or hydatid worm belongs to class Cestoda. E. granulosus causes cystic echinococcosis or hydatid disease in livestock and humans beings which acts as intermediate hosts and parasitize the small intestines of adult canids i.e. definitive hosts. It is a zoonotic disease.
What is the life cycle of epidermolysis granulosus?
Life cycle: E. granulosus is a digenetic parasite. The worm completes its life cycle in two hosts. Primary or definitive hosts are dog, wolf, fox and jackal while the secondary or intermediate hosts are sheep, pig, cattle, horse, goat and man. The most common definite host is dog and the intermediate host is sheep.
What is Echinococcus granulosus (hydatid worm)?
Introduction Echinococcus granulosus, also called hydatid worm belongs to class Cestoda It causes cystic echinococcosis in livestock and humans being intermediate hosts and parasitize the small intestines of adult canids It is a zoonotic disease Definitive hosts are carnivorous predators like dogs, wolves, foxes and lions.