introduction to trematoda

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Introduction to trematoda. Assistanted Prof. Sheng. MORPHOLOGY. 1. SHAPE : Leaf-shape 、 tong-shape , Oral sucker 、 ventral sucker. 2. Digestive system : Compose with mouth 、 pharynx 、 esophagus 、 cecum. 3. Reproductive system :. Strong , most of them are hermaphrodite. - PowerPoint PPT Presentation


  • Introduction to trematodaAssistanted Prof. Sheng

  • 2. Digestive systemCompose with mouth pharynxesophagus cecum MORPHOLOGY1. SHAPELeaf-shapetong-shapeOral suckerventral sucker

  • ovaryootypeUterine tube Seminal receptacleLaurers canalEggmodelMeglands Vitelline glands and uterus.Strong , most of them are hermaphrodite3. Reproductive system

  • testes efferent ductule deferential duct seminal vesicle prostate penis packet of penis.

  • a. adult parasite in human being and mammal,worm parasite in aquatic animal (example:snail)Life cyclecomplication

  • b. Growing process include:eggmiracidiumsporocystrediacercariametacercariaYoung wormadult

  • Clonorchis sinensis

  • morphology1. adultShape:




  • 2. eggShape :



    Egg shell:


  • Life cycleadultEgg Egg pass into water in fecesEgg are swallow by snail and hatch by itmiracidiumsporocystrediacercariaAll these stages grow in snailmetacercaria

    Cercaria leave snail and eated by fresh-water fish Man is infected byEating uncooked fishYoung wormadult

  • Pathogenesis and clinical maniefstationThe pathogenesisAdults mechanical destructionSecretion and excretions toxicityIt cause the sell of duct fall off and cause the sell have hyperplasia and inflammation The tissue fibre The worm blockageThe duct wall become thickThe ductBecome narrowDuct blockageBile retention Duct expandThey cause liver sellAtrophy, necrosis and cirrhosis cirrhosis

  • The diseasesBlockage icterusCholangitis and hepatitisCholelithiasiscirrhosisLiver duct cancerActute hemorrhagic necrosis of pancreas

  • Adult parasite in the bile

  • cholelithiasis

  • cholelithiasis

  • Ascites and epigastric

  • Liver parm

  • Spider-shape vein

  • Actute hemorrhagic necrosis of pancreas

  • Clinical manifestationMost of them have no obvious symptom

    Some feel tiredness ,hepatic enlargement, right upper quadrant mild pain ,abdominal pain ,anorexia, dizziness.

    When it become serious the patient has ascites , unconscious and will die later.

  • DiagnosisDialogue about case histories:a. Whether come from epedemiologic area b. Whether have the habit of eating raw fresh water fish or shrimp

  • 1.laboratory diagnosis : Detect eggs make sure diagnosisa. Stool examination Direct amear methodNature sedimentationmethodFormalin ether methodb. The duodenum secretion examination

  • 2. Immunologic examinationIH test


    ELISA3. Ultrasonic wave examination

  • epidemiology Local epidemic

    Infective rate :1%~30%,some are 80%

    Epidemic area: JapanKorea Vinan Thailand

  • China:

  • Epidemic factor:Infective resource: patient and carrier , reservoir hostSpread way:egg pass into water in feces intermediate host exit ,people have the habit of eating raw fish or raw shrimbSusceptible people : all people

  • treatment1.hygiene educationDo not eat raw fish or raw shrimbNot let cat eat raw fish or raw shrimb too2.treat the patient and carrier3. Not let the feces pass into the fresh-water