Parasitology helmintCestoda (Echinococcus).pptx

Parasitology

1. Platyhelminthes Class Cestoda Echinococcus granulosus

2. General information's 1-life cycle: in direct life cycle 2-final host: Doge and other Carnivores 3-Intermediat host : Herbivores( sheep,cattle ) man( accidental host) 4-infective stage :egg for (Man and intermediate host Hydatid cyst for (final host and dog). 5-Disease name: Echinococcosis( Hydatid cyst) disease Morphology: A-very small,less than 1Cm B-has scolex with 4 sukers C-has neck D-body has segmented

3. Hydatid cyst 1- Its largest larval stage of Cestodes may reach in size of child head or foot ball development in size depend on: a-Site of its Implantation b-Time of its development 2- Hydatid cyst consist from following structures: a-Layers: internal (germinal)and Laminated Layer b- content of cyst : 1-Fluid 2- Scolices 3- Brood capsule 4-Hydatid Sand .

4. There are 3 types of Hydatid cyst A- Unilocular Hydatid cyst Its rounded in shape, only single cyst B- Osteous Hydatid cyst Its also Unilocular but take shape from bony stream C-Multilocular It has very thin laminated layer

5. Hydatid cyst life cycle in the intermediate host

6. Hydatid cyst life cycle

7. Pathogenesis: . Signs And Symptoms This depends upon the size and location of the hydatid cyst. The patients are asymptomatic and the incubation period may be in years when the cyst appears and is clinically diagnosed. There are nonspecific symptoms of: Nausea ., Weight loss, Weakness ,Other symptoms are due to the pressure of these cysts. 1-In the case of the liver cyst: The patient may have abdominal pain ,Nausea , and vomiting , There may be obstructive jaundice. 2-In the case of the lung: There will be a chronic cough , Chest pain and shortness of breath. Rupture of the cyst naturally or by taking the sample may lead to anaphylactic shock. *Asymptomatic infection , Hepatomegaly ,Cough ,Pressure on different organs. Rupture of the cyst may cause allergic reactions like anaphylactic reaction.

8. Diagnosis 1-Microscopy of hydatid cyst fluid to see scolices , daughter cyst, brood capsules, or hydatid sand. 2-A complete blood picture may show eosinophilia. 3-Haemagglutination test with significant titer above 1:100. This is more specific than the traditional Casoni’s test. 4-Direct microscopic examination for ova and parasite. 5-Bone marrow biopsy. 6-CT scan or ultrasonography to find a hydatid cyst

9. This figure was uploaded by  Franz J Conraths