westermani卫氏并殖吸虫
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I. morphology
1. Adult: The body is elliptic, dorsally it is convex,
ventrally it is flattened, reddish-brown in color, about 7.512×4-6×1-3 mm (length:width=2:1). It looks like half a peanut. The sizes of two suckers are sub-equal. The ventral sucker is located in the central position of the body. Two testes, the ovary and the uterus are situated side by side. The vitellaria is well developed. The excretory bladder extends forward to the level of pharynx. The digestive tract is divided into two ceca.
invades
Cercariae
Melania snail
Escape
asexual reproduction
Cercariae Daughter rediae Mother rediae Sporocysts
III. Pathology and Symptomatology
Adults inhabit lungs, although other organs are also involved.
crayfish with metacercaria
────────────────────────────
Metacercariae
Eggs get into water
invade crab
In Water
25-30℃
and crayfish
3-4weeks
Miracidia hatch out
Hale Waihona Puke Baidu
A adult of Paragonimus westermani
A adult of P. westermani
2. Egg is irregularly elliptic, golden yellow in
color, 80-110×48-60µ in size. The thick and asymmetric shell with a distinct operculum encloses an ovum surrounded by more than 10 yolk cells.
penetrate the diaphragm
adolescents
adults in lungs
eggs
Migrate to the lungs
excystation
In Human Body
duodenum
Discharged
in sputum
man eats raw crab or
or in feces
1. Pathological lesions may be classified into 4 stages: (1)Invading and migrating stage: After
excystation the adolescents penetrate the intestinal wall and
3. Metacercaria is spherical, about 300-
400µ with two layers of transparent walls, in crab and crayfish.
. The oval ova have an operculum and are 80-110 by 48-80 µm. It is golden yellow in color. The shell is uneven in thickness. The content is an ovum and more than 10 yolk cells.
migrate to the lungs. (2) Suppurative stage. The bleeding
and infiltration of neutrophils and eosinophils surrounding worms form a capsule, abscess.
(3) Cystic stage, the cyst wall is formed due to the progressive fibrosis of the surrounding tissue. The cystic contents are chocolate or rusty thick fluid with eggs and CharcotLeyden crystals( 夏 科 - 雷 登 氏 晶 体 ） , which looks like sesame paste. The shadow of the cyst can be seen on X-ray. Patients cough out the rusty sputum when the cyst communicates with the bronchioles. (4) Fibrous-scar stage, the worms are dead or escape from the cyst. The exudate and pus are expelled or absorbed and replaced by fibrous-scar tissue.
Egg of P. westermani
II. Life cycle
1. Infective stage: metacercaria 2. Infective mode: eating raw fresh water crabs and crayfish with metacercariae 3. Infective route: by mouth 4. Site of inhabitation: lungs 5. Intermediate hosts: 1st int. host is melania snail(川 卷螺). 2nd int. hosts are crab and crayfish. 6. Reservoir hosts: carnivores such as tiger, lion, wolf, fox, dog, leopard, cat and etc 7. Life span: 5-6 years
1. Adult: The body is elliptic, dorsally it is convex,
ventrally it is flattened, reddish-brown in color, about 7.512×4-6×1-3 mm (length:width=2:1). It looks like half a peanut. The sizes of two suckers are sub-equal. The ventral sucker is located in the central position of the body. Two testes, the ovary and the uterus are situated side by side. The vitellaria is well developed. The excretory bladder extends forward to the level of pharynx. The digestive tract is divided into two ceca.
invades
Cercariae
Melania snail
Escape
asexual reproduction
Cercariae Daughter rediae Mother rediae Sporocysts
III. Pathology and Symptomatology
Adults inhabit lungs, although other organs are also involved.
crayfish with metacercaria
────────────────────────────
Metacercariae
Eggs get into water
invade crab
In Water
25-30℃
and crayfish
3-4weeks
Miracidia hatch out
Hale Waihona Puke Baidu
A adult of Paragonimus westermani
A adult of P. westermani
2. Egg is irregularly elliptic, golden yellow in
color, 80-110×48-60µ in size. The thick and asymmetric shell with a distinct operculum encloses an ovum surrounded by more than 10 yolk cells.
penetrate the diaphragm
adolescents
adults in lungs
eggs
Migrate to the lungs
excystation
In Human Body
duodenum
Discharged
in sputum
man eats raw crab or
or in feces
1. Pathological lesions may be classified into 4 stages: (1)Invading and migrating stage: After
excystation the adolescents penetrate the intestinal wall and
3. Metacercaria is spherical, about 300-
400µ with two layers of transparent walls, in crab and crayfish.
. The oval ova have an operculum and are 80-110 by 48-80 µm. It is golden yellow in color. The shell is uneven in thickness. The content is an ovum and more than 10 yolk cells.
migrate to the lungs. (2) Suppurative stage. The bleeding
and infiltration of neutrophils and eosinophils surrounding worms form a capsule, abscess.
(3) Cystic stage, the cyst wall is formed due to the progressive fibrosis of the surrounding tissue. The cystic contents are chocolate or rusty thick fluid with eggs and CharcotLeyden crystals( 夏 科 - 雷 登 氏 晶 体 ） , which looks like sesame paste. The shadow of the cyst can be seen on X-ray. Patients cough out the rusty sputum when the cyst communicates with the bronchioles. (4) Fibrous-scar stage, the worms are dead or escape from the cyst. The exudate and pus are expelled or absorbed and replaced by fibrous-scar tissue.
Egg of P. westermani
II. Life cycle
1. Infective stage: metacercaria 2. Infective mode: eating raw fresh water crabs and crayfish with metacercariae 3. Infective route: by mouth 4. Site of inhabitation: lungs 5. Intermediate hosts: 1st int. host is melania snail(川 卷螺). 2nd int. hosts are crab and crayfish. 6. Reservoir hosts: carnivores such as tiger, lion, wolf, fox, dog, leopard, cat and etc 7. Life span: 5-6 years