蛔虫、鞭虫、钩虫寄生虫

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migration down cecum
Larvae do not enter circulation system!
adults
(cecum)
蛔虫、鞭虫、钩虫寄生虫
蛔虫、鞭虫、钩虫寄生虫
4. Pathology
Feeding on tissue fluid and blood; The slender anterior ends penetrate into the
(4) An ovum is in the egg when it passed with stool
蛔虫、鞭虫、钩虫寄生虫
3. Life cycle
1T~7T/daily moist、warm
adults
eggs
infective eggs
(cecum)
3~5w
ingestion
larvae
(small intestine)
gut mucosa and make lesions;
蛔虫、鞭虫、钩虫寄生虫
Symptoms:
Symptoms are determined largely by the worm
burden: light infections are asymptomatic. Heavier infections are characterized by:
蛔虫、鞭虫、钩虫寄生虫
三、致病(pathogenesis)
1、幼虫致病
蛔虫性哮喘
2、成虫致病
掠夺营养
引起变态反应 哮喘,荨麻疹 并发症
蛔虫、鞭虫、钩虫寄生虫
来自百度文库录像
并发症
(国内报告 8468例)
胆道蛔虫症 4556例(53.8%) 蛔虫性肠梗阻 2337例(27.6%) 蛔虫性阑尾炎 143例 蛔虫性胰腺炎 17例 蛔虫性哮喘 1352例 蛔虫性肝脓肿 33例
Mouth cavity is provided with a minute spear
2) Male: about 4 cm long, posterior is spirally coiled.
3) Female: about 5 cm long, posterior extremity straight.
蛔虫、鞭虫、钩虫寄生虫
四、诊断(diagnosis)
直接涂片法 改良加藤法
五、流行与防治
(Endemity and Prevention)
蛔虫、鞭虫、钩虫寄生虫
流行
防治
Trichuris trichiura (毛首鞭形线虫)
1. Introduction:
The common name of
Trichuris trichiura is
二 生 活 史
录像
成虫
(小肠)

随粪入土
感染期卵
潮湿、荫蔽、O2充足 21-30。C
经口误食蛔虫、、孵鞭出虫、幼钩虫虫、寄体生虫内移行
蛔虫幼虫的体内移行:
侵入肠粘膜的小V、小L
门静脉 肝
右心 肺
肺泡(蜕皮2次) 支气管
气管

食管 胃
小肠(蜕皮1次)
蛔虫、鞭虫、钩虫寄生虫
生活史的特点:
1、寄生部位:小肠 2、感染阶段:感染期卵 3、感染途径:经口感染 4、雌虫产卵:每天可多达24万个
whip-worm(鞭虫), adults
live in caecum (盲肠) of human and result in trichuriasis(鞭虫病)
蛔虫、鞭虫、钩虫寄生虫
2. Morphology:
1) Adults resemble a whip, anterior with a hair-like lash and posterior with the handle.
growth retardation
蛔虫、鞭虫、钩虫寄生虫
5. Diagnosis
Diagnosis is based on symptoms and the presence of eggs in feces
蛔虫、鞭虫、钩虫寄生虫
6. Prevalence and control
Trichuriasis often prevail with ascariasis 17.38% of population infected with this
1) chronic mucous and bloody diarrhea 2) abdominal pains 3) hemorrhage and anemia (贫血) or rectal prolapse
(直肠脱垂) in heavy infection children 4) The infection may result in malnutrition and
蛔虫、鞭虫、钩虫寄生虫
4) Egg
(1) A typical barrel shape with two polar plugs
(2) Size: 50-54 µm by 22-23 µm
(3)The external layer of the shell of the egg is yellow brown
蛔虫、鞭虫、钩虫寄生虫
似蚓蛔线虫(蛔虫)
Ascaris lumbricoides
一、形态
成 虫
活体
15~31cm ♂
蛔虫、鞭虫、钩虫寄生虫
20~35cm

蛔 虫
唇 瓣
扫 描 电 镜 图
蛔虫、鞭虫、钩虫寄生虫
虫卵
蛋白质膜

卵壳


卵细胞


新月形间隙
精 卵
卵黄颗粒
脱蛋白质 膜受精卵
蛔虫、鞭虫、钩虫寄生虫
P172
Ascaris Lumbricoides
蛔虫、鞭虫、钩虫寄生虫
Ascaris Lumbricoides
Ascaris lumbricoides , common saying “round worm of man”, is the largest of the intestinal nematodes parasitizing humans. It is the most common worm found in human. It is worldwide in distribution and most prevalent through out the tropics, subtropics and more prevalent in the countryside than in the city
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