Introduction to trematoda
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Transcript of Introduction to trematoda
Introduction to trematoda
Assistanted Prof. Sheng
2. Digestive system :Compose with mouth 、 pharynx 、esophagus 、 cecum
MORPHOLOGYMORPHOLOGY1. SHAPE :
Leaf-shape 、 tong-shape ,
Oral sucker 、 ventral sucker
ovary 、 ootype 、Uterine tube Seminal receptacle 、 Laurer’s canal 、 Egg’model 、 Me’glands 、 Vitelline glands and uterus.
Strong , most of them are hermaphrodite
3. Reproductive system3. 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 Life cyclecyclecomplication :
b. Growing process include:
egg miracidium sporocyst redia cercaria
metacercaria Young worm adult
do you know what disease you will suffer from by eating raw fish and shrimb
Clonorchis sinensisClonorchis sinensis
morphology
1. adult
Shape:
Sucker:
Cecum:
Hermaphrodite:
2. eggShape :
Size:
Colour:
Egg shell:
Content:
operculum
Shoulder peak
miracidium
Verrucous thing
Life cycle
adult Egg Egg pass into water in feces
Egg are swallow by snail and hatch by it
miracidium sporocyst redia cercaria
All these stages grow in snail
metacercaria
Cercaria leave snail and eated by fresh-water fish
Man is infected byEating uncooked fish Young worm adult
Pathogenesis and clinical maniefstation
The pathogenesis
Adult’s mechanical destructionSecretion and excretion’s toxicity
It cause the sell of duct fall off and cause the sell have hyperplasia and inflammation
The tissue fibre The worm blockage
The duct wall become thick The ductBecome narrow
Duct blockageBile retention Duct expand
They cause liver sellAtrophy, necrosis and cirrhosis
cirrhosis
The diseases
Blockage icterus
Cholangitis and hepatitis
Cholelithiasis
cirrhosis
Liver duct cancer
Actute hemorrhagic necrosis of pancreas
Adult parasite in the bile
Adult crow in liver duct
Blockage icterus
Adult in the duct
cholelithiasis
cholelithiasis
Ascites and epigastric
Liver parm
Spider-shape vein
Liver duct cancer
Actute hemorrhagic necrosis of pancreas
dwarf
No symptom
Clinical manifestation
Most 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.
Diagnosis
Dialogue 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 diagnosis
a. Stool examination
Direct amear methodNature sedimentation’methodFormalin –ether method
b. The duodenum secretion examination
2. Immunologic examination
IH test
IHA
ELISA
3. Ultrasonic wave examination
epidemiology
• Local epidemic
•Infective rate :1%~30%,some are 80%
•Epidemic area: Japan 、 Korea 、 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 shrimb
Susceptible people : all people
treatment1.hygiene education
Do not eat raw fish or raw shrimbNot let cat eat raw fish or raw shrimb too
2.treat the patient and carrier
3. Not let the feces pass into the fresh-water
Now do you still dare
to eat the raw fish or r
aw shrimb !?