1 / 10

Trematodes (flukes)

Trematodes (flukes). Classifided into: 1-Blood flukes ( Schistosomes ) 2-Tissue flues. Blood flukes (Schistosomes). Species of schistosomes infect human 1- S. haematobium 2- S. mansoni 3- S. japonicum 4- S. intrcalatum 5- S. meckongi.

manny
Télécharger la présentation

Trematodes (flukes)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Trematodes (flukes) Classifided into: 1-Blood flukes (Schistosomes) 2-Tissue flues

  2. Blood flukes (Schistosomes) Species of schistosomes infect human 1- S. haematobium 2- S. mansoni 3- S. japonicum 4- S. intrcalatum 5- S. meckongi

  3. General features of schistosomes 1-Adult worms are • -elongated and resemble roundworms. • -live in blood vascular system. • -have separated sexes (diecious). • -Posses an oral and ventral suckers. • -body cavity is absent. • -have highly developed and complex reproductive system. • -have simple nervous and excretory systems. • -Posses an incomplete alimentary canal; no anus.

  4. 2- The fundamental stages in life cycle are the egg , larva and the adult. -Egg is provided with spine but without operculum. -The larval stages are miracidium, mother and daughter soporocysts and cercaria (but no redia or metacercaria formation as in tissue flukes). 3- the forked tailed cercariae is the infective stage to man. 4-infect human by penetration of unbroken skin by cercariae.

  5. Morphology Schistosomas in copula

  6. Life cycle of Schistosoma Species

  7. Pathogenesis and clinical features 1- egg deposition. 2-liberation of antigens of adult worms and eggs. -Retention of eggs in the blood vessels: 1-eggs wedged firmly into the small vessels. 2-Sharp spines. -Liberation of eggs from the tissues into the lumen of the intestine or bladder: 1- enzyme elaborated by the miracidium . 2- necrosis of the tissue caused by pressure . 3-the effect of the spine.

  8. -Clinical manifestations of schistosomiasis 1-schistosome dermatitis 2-acute schistosomiasis 3-chronic schistosomiasis 1-schistosome dermatitis (swimmer’s itch) -cercariae of the blood flukes of aquatic birds 2-acute schistosomiasis (Katayama fever) -Beginning of oviposition, usually 20 to 50 days after primary exposure. -flu like illness with fatigue, headache, arthralgia and night sweats, sometimes with hepatosplenomegaly, cough, dyspnea and chest pain.

More Related