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on November 21, 2022

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Life cycle of Multiceps multiceps

Multiceps multiceps Life cycle Multiceps multiceps Common name: Gid, sturdy, staggers Predilection site: Brain and spinal cord (intermediate hosts); small intestine (final hosts) Definitive hosts: Dog, fox, coyote, jackal Intermediate hosts: Sheep, goat, cattle, deer, pig, horse, man Eggs come out with dog faeces → Ingested by intermediate host with contaminated feedstuff → Eggs hatch in the intestine of the intermediate host → oncospheres are released and passes through the intestinal wall into the blood or lymph. → that circulate in blood until they lodge in suitable organs (including skeletal muscle, eyes, brain and subcutaneous tissue) → metacestode (Coénurus cerebralis) develop in the brain or spinal cord (larvae in other tissues fail to complete their development) → maturation take place and develop to fluid containing cyst with several hundred protoscolices (6-8 months) Final host become infected by ingestion of the bladder worms containing goat brain or s

Life cycle of Davainea proglottina

Davainea proglottina Predilection site: Small intestine, particularly the duodenum Final hosts: Chicken, turkey, pigeon and other galli [1] naceous birds Intermediate hosts: Gastropod molluscs such as Agriolimax, Arion, Cepaea and Limax Life cycle: Gravid proglottids are shed in faeces and eggs are ingested by various gastropod molluscs, in which they develop to the cysticercoid stage after about 3 weeks. Following ingestion of the mollusc by the final host, the cysticercoids develop into adult tapeworms in about 2 weeks.

Life cycle of Ehinoccoccus granulosus

Cystic Echinococcosis ( Ehino c coccus granulosus sensu lato) Predilection site: Anterior small intestine (final host); mainly liver and lungs (intermediate host) Final hosts: E. granulosus granulosus: dog and many wild canids; E. granulosus equinus: dog and red fox Intermediate hosts: man and hervorous ruminants. The adult Echinococcus granulosus (sensu lato) (2—7 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. After ingestion by a suitable intermediate host, eggs hatch in the small intestine and release six-hooked oncospheres that penetrate the intestinal wall and migrate through the circulatory system into various organs, especially the liver and lungs. In these organs, the oncosphere develops into a thick-walled hydatid cyst that enlarges gradually, producing protoscolices and daughter cysts that fill the cyst interior. The definitive host

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