《蛔虫、鞭虫、钩虫》PPT课件

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1、AscarisLumbricoidesP172AscarisLumbricoidesAscarislumbricoides,commonsaying“roundwormofman”,isthelargestoftheintestinalnematodesparasitizinghumans.Itisthemostcommonwormfoundinhuman.Itisworldwideindistributionandmostprevalentthroughoutthetropics,sub-tropicsandmoreprevalentinthecoun

2、trysidethaninthecity似蚓蛔线虫（蛔虫）Ascarislumbricoides♀♂一、形态成虫活体20~35cm15~31cm蛔虫唇瓣扫描电镜图“品”受精卵未受精卵脱蛋白质膜受精卵虫卵蛋白质膜卵壳卵细胞新月形间隙卵黄颗粒成虫（小肠）卵随粪入土潮湿、荫蔽、O2充足21-30。C感染期卵经口误食、孵出幼虫、体内移行二生活史录像侵入肠粘膜的小V、小L右心门静脉肝肺肺泡（蜕皮2次）咽支气管气管食管胃小肠（蜕皮1次）蛔虫幼虫的体内移行：生活史的特点：1、寄生部位：2、感染阶段：3、感染途径：4、雌虫产卵：小肠感染期卵经口感染每天可多达24万个三、

3、致病（pathogenesis)录　像1、幼虫致病2、成虫致病蛔虫性哮喘并发症掠夺营养引起变态反应哮喘,荨麻疹并发症(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例直接涂片法四、诊断（diagnosis)流行五、流行与防治(EndemityandPrevention)改良加藤法防治Trichuristrichiura(毛首鞭形线虫)1.Introduction:ThecommonnameofTrichuristrichiuraiswhi

4、p-worm(鞭虫),adultsliveincaecum(盲肠)ofhumanandresultintrichuriasis(鞭虫病)2.Morphology:1)Adultsresembleawhip,anteriorwithahair-likelashandposteriorwiththehandle.Mouthcavityisprovidedwithaminutespear2)Male:about4cmlong,posteriorisspirallycoiled.3)Female:about5cmlong,posteriorextremityst

5、raight.4)EggAtypicalbarrelshapewithtwopolarplugs(2)Size:50-54µmby22-23µm(3)Theexternallayeroftheshelloftheeggisyellowbrown(4)Anovumisintheeggwhenitpassedwithstool3.Lifecycleadults（cecum）eggs1T~7T/dailymoist、warm3~5winfectiveeggslarvae（smallintestine）adults（cecum）migrationdowncecu

6、mLarvaedonotentercirculationsystem！ingestion4.PathologyFeedingontissuefluidandblood;Theslenderanteriorendspenetrateintothegutmucosaandmakelesions;Symptoms:Symptomsaredeterminedlargelybythewormburden:lightinfectionsareasymptomatic.Heavierinfectionsarecharacterizedby:1)chronicmucou

7、sandbloodydiarrhea2)abdominalpains3)hemorrhageandanemia(贫血)orrectalprolapse(直肠脱垂)inheavyinfectionchildren4)Theinfectionmayresultinmalnutritionandgrowthretardation5.DiagnosisDiagnosisisbasedonsymptomsandthepresenceofeggsinfeces6.PrevalenceandcontrolTrichuriasisoftenprevailwithasca

8、riasis17.38%ofpopulationinfectedwiththis