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Samenvatting Trematoden Parasitologie

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dit is een onderdeel van het 3e jaars vak Parasitologie

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TREMATODEN
Algemene levenscyclus:
- Totale ontwikkeling van ei tot adult heeft 4 fasen:
1) Vrije larvale fase:
→ Binnen eischaal ontwikkelt een gecilieerde miracidium larve
→ Komt vrij via operculum en moet binnen 24 uur geschikte slak vinden


2) Parasitaire fase in de slak:
→ Miracicium dringt slak binnen en vormt zich om tot sporocyste
→ In de sporocyste wordt een redien larve gevormd
→ Redien barsten uit de sporocyste
→ Uit de redien ontstaan cercariae die slak actief verlaten


3) Infesterende larvaire fase:
→ Kan vrij of parasitair zijn:
▪ Vrije fase (heeft 2 opties):
• Cercarien dringen eindgastheer percutaan binnen (furcocercaria)
• Cercarien hechten zich vast aan plant en encysteren (metacercaria)
▪ Parasitaire fase:
• Cercarien invaderen 2de tussengastheer en encysteren tot metacercaria


4) Volwassen fase:
→ Eindgastheer besmet zich door orale of percutane opname van cercaria
→ Migreren naar orgaan waar worm volwassen wordt

, Echinostoma revolutum
Kenmerken:
- Komt voor in caeca/rectum bij watervogels (ook duif, kip, parelhoen en zelden mens)
- 10-22 mm



Levenscyclus:
- Algemene cyclus met 2 tussengastheren:
→ Miracidium dringt zoetwaterslak binnen en ontwikkelt tot cercaria
→ Cercaria verlaat slak en zoekt 2de gastheer op (bv. slak, vis, kikkervisje…)
→ Dringt 2de gastheer binnen via cloaca en encysteert id nieren tot metacercaria
→ Eindgastheer eet 2de tussengastheer en worm wordt volwassen

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