猪囊尾蚴 cysticercus cellulosae 组员:杨滨 袁镜乐 杨童周 张迪. introduction adult...
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猪囊尾蚴Cysticercus cellulosae
组员:杨滨 袁镜乐 杨童周 张迪
Introduction
Adult : Taenia solium (猪带绦虫)
Taeniidae ( 带科 ) Taenia (带属)
Final hosts : humans Intermediate hosts : pigs,wild
pigs( 野猪 ) , dogs,camels,cats etc.
Sites: skeletal muscles( 横纹肌 ) , heart( 心 ) , brain(脑), eye (眼) etc.
Morphology
Cysticercus cellulosaeoval,as big as soy beansemitransparent cyst( 半透明包囊 )filled with liquidnodule( 小结 ):a scolex inside,4 suckers and many hooks on the scolex
MorphologyAdultlength : 2~5m700-1000 proglottidsscolex:sphericity,25~50hooks,4suckersmature proglottid: without digestive system( 无消化系统 ),a reproductive system in each( 每个成节均有 1 套雌雄生殖器官 )gravid proglottid:full of eggs
Life cycle
A taperworm larval cyst is ingested by human through poorly cooked infected meat.
The larval escapes the cyst and passes to the small intestine( 小肠 )where it attaches to the mucosa by the scolex suckers.
Life cycle
The proglottids develop as the worm matures in 3~4 months.
The adult may live in the small intestine for as long as 25 years and pass gravid proglottids with the feces.
Eggs extruded from the proglottid contaminate and persist on vegetation for several days and are consumed by pigs in which they hatch and form cysticerci in muscle.
Life cycle
Epidemiology
Pigs can be infected by ingestion of eggs in feed contaminated with human feces
Human may become infected with cysticercus by eating raw or improperly cookd infected pork
No obvious seasonality,but rise in warm seasons
Sporadicity( 散发性 ) Susceptible animal:3~5 years in pigs
Signs
no obvious signs in a general way under serious infection malnutrition( 营养不良 ),growthretardation,anaemia
( 贫血 ),muscle edema( 水肿 ) “drunkenness( 醉酒状 )"
Lesions(病变) Pork is pale and moist
Cysticercus can be found in muscle as well as brains,eyes,livers,spleens,lungs and even in lymph bodes and fat
Cell infiltration then fibrosis and become calcification after death about half year
Diagnosis
Contour (外形) Eyelid (眼皮) Eye ground (眼底) Lingual root (舌根) Inner thighs (大腿里)
1.experience of the public
Diagnosis
cardiac muscle( 心肌 ) masseter( 咬肌 ) lingual muscle( 舌肌 ) limbs( 四肢 )
2.Sanitary inspection of the pork
A definite diagnosis can be made with finding cysticercus in those sites.
Diagnosis
Control Periodic inspection,
deworming : Praziquantel( 吡喹酮 ) , Albendazole( 丙硫苯咪唑 ) , Flubendazole( 氟苯咪唑 )
Positive census of cysticercus cellulosae patients Enhance excrement management Ban no inspection of pork listed Change your diet
References
李国清 . 兽医寄生虫学 ( 双语版 ). 北京 : 中国农业大学出版社 ,2006
internet
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