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1、Ascaris LumbricoidesP172 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,sub-tropics and more
2、 prevalent in the countryside than in the city 2035cm1531cm蛋白质膜蛋白质膜卵壳卵壳卵细胞卵细胞新月形间隙新月形间隙卵黄颗粒卵黄颗粒1、寄生部位：2、感染阶段：3、感染途径：4、雌虫产卵：哮喘哮喘,荨麻疹荨麻疹(国内报告国内报告 8468例例)胆道蛔虫症胆道蛔虫症 4556例例(53.8%)蛔虫性肠梗阻蛔虫性肠梗阻 2337例例(27.6%)蛔虫性阑尾炎蛔虫性阑尾炎 143例例蛔虫性胰腺炎蛔虫性胰腺炎 17例例蛔虫性哮喘蛔虫性哮喘 1352例例蛔虫性肝脓肿蛔虫性肝脓肿 33例例Trichuris trichiura(毛首鞭形线虫毛首鞭形
3、线虫)1.Introduction:The common name of Trichuris trichiura is whip-worm(鞭虫鞭虫),adults live in caecum(盲肠盲肠)of human and result in trichuriasis(鞭虫病鞭虫病)2.Morphology:1)Adults resemble a whip,anterior with a hair-like lash and posterior with the handle.Mouth cavity is provided with a minute spear2)Male:abou
4、t 4 cm long,posterior is spirally coiled.3)Female:about 5 cm long,posterior extremity straight.4)Egg (1)A typical barrel shape with two polar plugs(2)Size:50-54 m by 22-23 m(3)The external layer of the shell of the egg is yellow brown(4)An ovum is in the egg when it passed with stool 3.Life cycle ad
5、ults（cecum）eggs1T7T/daily moist、warm 35w infective eggs larvae（small intestine）adults （cecum）migration down cecum Larvae do not enter circulation system！ingestion 4.PathologynFeeding on tissue fluid and blood;nThe slender anterior ends penetrate into the gut mucosa and make lesions;Symptoms:Symptoms
6、 are determined largely by the wormburden:nlight infections are asymptomatic.nHeavier infections are characterized by: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
7、growth retardation 5.DiagnosisnDiagnosis is based on symptoms and the presence of eggs in feces 6.Prevalence and controlnTrichuriasis often prevail with ascariasisn17.38%of population infected with this parasite in China nThe treatment and control can refer to ascariasis十二指肠钩口线虫美洲板口线虫“C”“S”有有无无:1013
8、 x 0.6mm:8 11 x 0.40.5mm:911 x 0.4mm:7 9 x 0.3mm美洲美洲美洲1 1、边吸血边排血；、边吸血边排血；2 2、咬附部位渗血；、咬附部位渗血；3 3、更换咬附位置，原伤口仍渗血；、更换咬附位置，原伤口仍渗血；4 4、虫体活动造成组织、血管损伤引起失血。、虫体活动造成组织、血管损伤引起失血。1.1.种植蔬菜与经济作物地区种植蔬菜与经济作物地区 2.2.用新鲜粪便施肥用新鲜粪便施肥 3.3.种植时手脚接触泥土的机会多种植时手脚接触泥土的机会多1 1、被钩蚴污染的尿布；、被钩蚴污染的尿布；2 2、睡沙袋、穿、睡沙袋、穿“土裤子土裤子”；3 3、经胎盘感染；、经胎盘感染；4 4、经乳汁感染；、经乳汁感染；控制传染源控制传染源 a a).治疗钩蚴性皮炎治疗钩蚴性皮炎:用左旋咪唑或用左旋咪唑或15%15%b b).治疗钩虫病治疗钩虫病:首选肠虫清首选肠虫清(阿苯达唑阿苯达唑)联合用药联合用药,如如:甲苯咪唑甲苯咪唑+噻嘧啶噻嘧啶噻嘧啶噻嘧啶+左旋咪唑左旋咪唑 粪便无害化处理粪便无害化处理 个人防护个人防护 噻苯咪唑软膏涂擦噻苯咪唑软膏涂擦.
