What is 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 does Echinococcus multilocularis cause?
E multilocularis is the infection caused by tapeworms found in dogs, cats, rodents, and foxes. These tapeworms are around 1 to 4 mm long. The infection is called alveolar echinococcosis (AE). It is a life-threatening condition because tumor-like growths form in the liver.
What is the definitive host of Echinococcus multilocularis?
Echinococcus multilocularis is the second most common cause of echinococcosis in humans. The definitive hosts for E. multilocularis are also canids, but more commonly foxes than domestic dogs. Arvicoline rodents (voles and related species) also play an important role in the natural life cycle as intermediate hosts.
What is the difference between Echinococcus granulosus and multilocularis?
E. granulosus metacestode grows slowly to form unilocular cyst that expand and crowd the affected organs and tissues; conversely, E. multilocularis metacestode forms multivesiculated cystic mass and shows peripheral infiltration with central necrosis, which resembles invasive malignant tumors [1, 9].
What is the definitive host of Echinococcus granulosus?
Echinococcus granulosus definitive hosts are wild and domestic canids. Natural intermediate hosts depend on genotype. Intermediate hosts for zoonotic species/genotypes are usually ungulates, including sheep and goats (E. granulosus sensu stricto), cattle (“E.
What is the meaning of Echinococcus?
: any of a genus (Echinococcus) of tapeworms that alternate a minute adult living as a commensal in the intestine of carnivores with a hydatid larva invading tissues especially of the liver of cattle, sheep, swine, and humans and acting as a dangerous pathogen.
What is the definitive or primary host of Echinococcus granulosus?
What is zoonotic aspect of Echinococcus granulosus?
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.
Who Echinococcus classification?
Human echinococcosis is an infectious disease caused by the following species: E. granulosus, E. multilocularis, or E….
| Echinococcus | |
|---|---|
| Phylum: | Platyhelminthes |
| Class: | Cestoda |
| Order: | Cyclophyllidea |
| Family: | Taeniidae |
What is alveolar Echinococcus?
Alveolar Echinococcosis (E. multilocularis) Human alveolar echinococcosis (AE) is a potentially lethal infection caused by Echinococcus multilocularis, an intestinal tapeworm of carnivorous animals such as foxes, coyotes and domestic dogs.
How long is the prepatent period of Echinococcus spp?
The prepatent period of Echinococcus spp. may be as long as 1-2 months. Sexual maturation is reached within 4-5 weeks and eggs or gravid proglottids are shed in the feces
Where does Echinococcus multilocularis live in the body?
The adult Echinococcus multilocularis (1.2—4.5 mm long) resides in the small intestine of the definitive host. Gravid proglottids release eggs that are passed in the feces, and are immediately infectious.
How long does Echinococcus granulosus infection remain asymptomatic?
Echinococcus granulosus infections often remain asymptomatic for years before the cysts grow large enough to cause symptoms in the affected organs. The rate at which symptoms appear typically depends on the location of the cyst.
Where can I get Echinococcus multilocularis in my Dog?
Prevalence in these areas ranges from 1-12%. Infections have also been reported in Canada and the upper Midwestern states in the United States. Younger dogs are more commonly infected with Echinococcus spp. than older dogs. E. multilocularis can infect both dogs and cats, following ingestion of rodents with multilocular hydatid cysts.