蛔虫、鞭虫、钩虫

Ascaris.lumbricoides(似蚓蛔线虫)♂一、morhpology(形态)15~31cmAdultAscarisworms:FemaleandmaleAscarislumbricoidesThiswormisafemale,asevidencedbythesizeandgenitalgirdle(生殖孔).“品”AscanningelectronmicrographoftheanteriorendofAscarisshowingthethreeprominentlips.fertilizedegg---infective(受精卵)unfertilizedegg

---notinfective(未受精卵)

A"decorticated"fertilizedegg

(脱蛋白质膜受精卵)受精卵未受精卵蛋白质膜卵壳卵细胞新月形间隙卵黄颗粒二、lifecycle

(生活史)成虫（小肠）卵随粪入土潮湿、荫蔽、O2充足、

21-30℃感染期卵经口、孵出幼虫、体内移行录像基本发育过程: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）Larvamigrationroute(幼虫移行途径):生活史的特点：1.Parasiticlocation：2.Infectivestage:3.Infectionatrium:infectiveeggMouth(eatingcontaminatedfoodorwater)4.Adultfemalecanproduce200,000eggsperday.三、signsandsymptoms录像1、幼虫致病2、成虫致病蛔虫性哮喘、肺炎并发症掠夺营养变态反应哮喘,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directwetmountexaminationofthefeces

(粪便直接涂片法)四、diagnosis（诊断)流行五、

EndemityandPrevention

(流行与防治)防治WhipwormOneofthemostcommonparasitesofhumansDistributedthroughouttheworldinthesameareaswhereascarisandhookwormarefoundTrichuristrichiura

(毛首鞭形线虫)♀♂Theanteriorportionofthebodyislongandslender,posteriorportionwidensandthickens,likebullwhipFemaleislongerthanmale,35-50millimeter(mm).透明盖塞Eggsmeasure50to54µmby22to23µm.

typicallybarrel-shaped(纺锤状）,withtwoopercularplug(盖塞）Trichuristrichiuraegg成虫（盲肠）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、无体内移行成虫（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、体内移行蛔虫生活史：鞭虫生活史:(十二指肠钩口线虫)钩虫(美洲板口线虫)AncylostomaduodenaleNecatoramericanus(Hookworm)19

♂♂DifferentialcharacteristicofA.duodenaleandN.americanus

●size:A.duodenaleislargerthanN.americanus.●Shape:A.duodenalelikestheletter“C”

N.americanuslikestheletter“S”ScanningelectronmicrographoftheoralopeningofAncylostomaduodenale.Notethepresenceoffourcutting"teeth,"twooneachside.Necatoramericanus:

Theoralopeningofthisspeciescontainscutting"plates",no"teeth."

(十二指肠钩虫:两对钩齿)(美洲钩虫:一对板齿)Buccalcapsule

(口囊)Bursa&dorsalrayLong,wideandrounded,dorsalraytripartiteBroaderthanlong,dorsalraysmall,bipartite与钩虫吸血有关的结构⒈口囊内有钩齿或板齿.⒉咽管壁肌肉发达.⒊虫体前端的三种腺体.①头腺

②咽腺③排泄腺分泌抗凝素及Ach酶分泌Ach酶、蛋白酶及胶原酶分泌蛋白酶Hookworm

egg:mediumsizeathineggshell,transparent2-4cellswithinegg(Uncleavedembryos)

EggsofA.duodenaleandN.americanus

areindistinguishable钩虫卵卵细胞透明间隙卵壳Hookwormlifecycle(1)Eggsarepassedinfecestothesoil.(2)Thereleasedrhabditiformlarvaegrowinthefecesand/orthesoil(3)Rhabditiformbecomefilariform(third-stage)larvaethatareinfective(4)Filariformlarvaepenetratetheskin.(5)Filariformlarvaearecarriedthroughtheveinstotheheartandthentothelungs.

Theypenetrateintothepulmonaryalveoli,ascendthebronchialtreetothepharynx,andareswallowed.成虫（小肠）卵随粪入土潮湿、荫蔽、O2充足、温暖杆状蚴丝状蚴（感染期幼虫）

2次蜕皮经皮肤、体内移行2次蜕皮生活史侵入皮肤小V、小L右心肺肺泡咽支气管气管食管胃小肠（蜕皮2次）Migrantionpath:移行生活史的特点：1、寄生部位：2、感染期：3、感染途径：4、感染方式：5、迁延移行：6、丝状蚴特性：7、转续宿主：小肠丝状蚴皮肤、口、胎盘、乳汁等接触泥土、生食蔬菜和转续宿主肉类、母婴传播等向温性猪、犬、灵猫等停滞发育达200多天ClinicalfeaturesofhookwormdiseaseSiteSymptomsPathogenesisCutaneousinvasionandsubcutaneousmigrationoflarvaPulmonary(呼吸系统)Hematologic(血液)Localerythema,macules,papules(grounditch)Dermal(皮肤)Bronchitis,pneumonitisand,sometimes,eosinophiliaMigrationoflarvaethroughlung,bronchi,andtracheaIrondeficiencyanemia,录像PathogenesisandSymptomatology

贫血的原因：边吸血边排血咬附部位渗血更换咬附位置，原伤口仍渗血虫体活动造成组织、血管损伤引起失血.

HookwormanemiaMicrocytichypochromaticAnemia(小细胞低色素性贫血)diagnosisFindingthecharacteristiceggsinthefeces.Saturatedsaltsolutionflotationmethod.

(饱和盐水浮聚法)Hookwormlarvaeculturemethod.（1）Infectionsource：Patientsandcarriers（2）Transmissionmeans

：Infec