立克次体属汇总 PPT课件.ppt
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1、Rickettsia 徐桂香 王莹 赵云鹏 张爱娟 张璐娴 朱玉HowardRicketts立克次体属 (Rickettsia)柯克斯体属立克次体目东方体属埃立克体属巴通体属斑疹伤寒群生物群斑疹伤寒群生物群斑点热群生物群斑点热群生物群ReckettsialesCommoncharactersObligatedintracellularparasites;Relatedtoarthropodvector.;Zoonosis.Morphology&stainsArrangedirregularly;polymorphismSmallG-bacilli;Giemsastain:violetorblu
2、e;CulturalpropertiesBinaryfissionHavebothDNAandRNACulture:susceptibleanimal(guineapig),yolksacofchickembryo,cellculture.Resistanceweak,sensitivetoantibioticSurviveinlowtemperatureanddryconditionSulfanilamidecanstimulatereckettsiasproliferationAntigenicsturcturevGroupspecificantigenEndotoxin:similarl
3、ytoendotoxinofbacteriavSpecyspecificantigenmembraneprotein:Weil-Felixreaction(外斐反应):Detectanti-rickettsialantibodiesinapatientsserumbyagglutinationoftheproteusorganisms.(rickettsiapossesAgthatcross-reactwithAboftheOantigenofcertainproteus)PathogenicmechanismPathogenic Pathogenic materialmaterialPath
4、ogenicPathogenicmechanismmechanism Local Local(small bloodsmall blood vessels vessels inin lymphoid tissue lymphoid tissue)vascular endothelial cellsvascular endothelial cells Fever,headache,rashFever,headache,rash(First bacteremiaFirst bacteremia)(Second bacteremiaSecond bacteremia)vesselsvesselsEn
5、dotoxinEndotoxin 、Phospholipase ABiteorfecesofBiteorfecesofarthropodvectorPathogenic sitesPathogenic sitesPathogenicitypPathogenicmaterialsEndotoxin:similarlytoendotoxinofbacteriaPhospholipaseA:lysisthecellmembraneandlysosomemembraneofthehostcell,causinghemolysispPathogenicmechanism:invadetheepithel
6、ialcellsofsmallbloodvessulePathogenicmechanismPathogenic Pathogenic materialmaterialPathogenicPathogenicmechanismmechanism Local Local(small bloodsmall blood vessels vessels inin lymphoid tissue lymphoid tissue)vascular endothelial cellsvascular endothelial cells Fever,headache,rashFever,headache,ra
7、sh(First bacteremiaFirst bacteremia)(Second bacteremiaSecond bacteremia)vesselsvesselsEndotoxinEndotoxin 、Phospholipase ABiteorfecesofBiteorfecesofarthropodvectorPathogenic sitesPathogenic sitesInfectiverouteSource:Rickettsiaenormallyenterthebody(mammalianreservoir)throughthebiteorfecesofaninfecteda
8、rthropodvector.-arthropodvector:mite,tifck,louse,fleaPathogenicmechanism:invadetheepithelialcellsofsmallbloodvessulePathogenicmechanismPathogenic Pathogenic materialmaterialPathogenicPathogenicmechanismmechanism Local Local(small bloodsmall blood vessels vessels inin lymphoid tissue lymphoid tissue)
9、vascular endothelial cellsvascular endothelial cells Fever,headache,rashFever,headache,rash(First bacteremiaFirst bacteremia)(Second bacteremiaSecond bacteremia)vesselsvesselsEndotoxinEndotoxin 、Phospholipase ABiteorfecesofBiteorfecesofarthropodvectorPathogenic sitesPathogenic sites主要病原性立克次体 种类种类种类种
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