文档介绍：CESTODES-II
*
*
细粒棘球绦虫 Echinococcus granulosus
The adult worms of Echinococcus granulosus live in the intestine of carnivores
The larvae (hydatid cysts) parasitize in various herbivorous host, including sheep, cattle, and humans resulting in hydatid disease (hydatidosis)（包虫病、棘球蚴病）
*
*
Adult：2～7mm；
Scolex:
Rostellum
2 rows of hooks
Strobilum(3 proglottids)：
1 immature proglottid
1 mature proglottids
1 gravid proglottid
Morphology--Adult
*
*
与猪、牛带绦虫虫卵相似，在光镜下难以区别。
Morphology——Eggs
*
*
Morphology --hydatid cysts (棘球蚴)
*
*
Morphology --hydatid cyst (棘球蚴)
Cyst wall
(嚢壁)
germinal layer (生发层)
hydatid fluid
（棘球蚴液）
protoscolex (原头蚴)
daughter cyst
(子囊)
1cm ～40cm
*
*
Brood capsule
(生发囊)
Hydatid sands
(囊砂、棘球蚴砂)
Cyst wall:
Ps:Protoscolex 原头蚴 Bc:Brood capsule 生发囊 Gl:Germinal layer 生发层 Ft:Fibrous tissue 纤维组织 Cl:Chintin layer 角质层
*
*
Germinal layer 生发层(20-25μm)
Chintin layer 角质层(1-4mm)
Fibrous tissue 纤维组织
*
*
122 μm
170 μm
*
*
8 wks
Adult
(intestine
of carnivore)
—— （Egg）
ingested by
—— Oncosphere
sheep/humans
through gut
—— Hydatid cyst
liver/lung
ingested by carnivore ( the dog)
- Life cycle
grow to -1cm in 3-5mon
*
*