并殖吸虫病课件_1

《并殖吸虫病课件_1》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、ParagonimiasisIntruductionAkindofchronicdiseasecausedbyparagonimuswestermani,paragonimusszechuanensisandseveralotherrelatedspeciesAdultwormofparagonimuswestermaniinhabitlungsofthefinalhost,causingcough,chestpain,rustysputumandhemoptysisparagonimusszechuanensiscausesubcutaneo

2、usnodulesandmassesInfectedbyeatingrawcrayfishandfreshwatercrabEtiologyMorphologyAdultworm:theyaremonoecious,thereproductiveorgansareparallel,havetwosuckersEggs:goldenbrown,ovate,operculate,thesizeis80-120×48-60mMetacercariae:roundorovate.Diameter300-400m,1-3layersofcystwal

3、lLifeCycleManwithadultwormtomaturepassingeggsintowater2-3months21dayseatingmiracidiMetacercariafirstintermediatehost(specialsnail)secondintermediatehost3months(crayfishandfreshwatercrab)cercariaEpidemiologySourceofinfection:humansmammalsandotherwormcarriers,whichcanproduceeg

4、gsRouteoftransmission:1.Thepresenceofthefinalhost:patientsandtheinfectedmammals2.Thepresenceofalargeamountof1stand2ndintermediatehost3.ThehabitofeatingthefreshwatercrayfishandcrabSusceptibility:everyoneissusceptiveCharacterofEpidemicWidelydistributed:Asia,Africa,Americainour

5、country,morethan21provincesareinvolvedintheinfectionItmainlyoccursinsummerandautumnNorth:thetypeofcrayfishepidemicSouth:thetypeoffreshwatercrabepidemicPathogenesisandPathogenProcessCausedbyJuvenileWormsMetacercariaeexcystinduodenum,andintoabdominalcavity,themigratecausemecha

6、nicallesionsPenetratediaphragmsintopleuralcavitytocauselungcystThepathologicalchangecausedbypagumogonimusskjabininclude:subcutaneousnodulesmass,exudativepleurisy,liverlesion,andeosinophilia.ThetypicallesionareeosinophilousgranulomasProcessCausedbyAdultWormsInhabitlungsMigrat

7、ethroughlaceratedforamenintocranialcavity,invadeintothebrainInvadeintogreaterpsoasmuscleMigratethroughintervertabralforamenintoepiduralcavityAllthesecausingspaceoccupyinglesionProcessCausedbyEggsThereactionisslightBasicPathologicalLesionTheprocessaredividedintothreestages:Ab

8、scessstage:thewormsmigratefromintestinetolung,resultinhemorrhagenecrosisoft