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Investigations into the vector competency of arthropods for two Ehrlichias: Ehrlichia risticii and Cowdria rumantium

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dc.contributor.authorHahn, Ninaen
dc.contributor.committeechairZajac, Anne M.en
dc.contributor.committeememberSchurig, Gerhardt G.en
dc.contributor.committeememberPerry, Brian D.en
dc.contributor.committeememberSonenshine, Danielen
dc.contributor.committeememberKocan, Katherine M.en
dc.contributor.departmentVeterinary Medical Sciencesen
dc.date.accessioned2014-03-14T21:19:03Zen
dc.date.adate2005-09-20en
dc.date.available2014-03-14T21:19:03Zen
dc.date.issued1990-05-05en
dc.date.rdate2005-09-20en
dc.date.sdate2005-09-20en
dc.description.abstractThree studies relating to the vector competency of several species of ticks and <i>Simulium</i> spp. (blackflies) for <i>Ehrlichia risticii</i>, causative agent of Potomac horse fever (PHF) and <i>Amblyomma variegatum</i> for <i>Cowdria ruminantium</i>, causative agent of heartwater, are described. <i>Dermacentor variabilis, Rhipicephalus sanguineus, Amblyomma americanum and Ixodes scapularis</i> ticks were investigated for their ability to acquire and transmit PHF. Larval and nymphal ticks were exposed to <i>E. risticii</i> by feeding on mice inoculated with the organism. Molted exposed ticks were then allowed to feed on susceptible ponies or mice and were examined by light and electron microscopy. No evidence of transmission, either clinically or by seroconversion in mice or ponies was observed. Blackflies (<i>Simulium</i> spp.) were trapped in an area endemic for PHF and inoculated into mice in an attempt to demonstrate <i>I. risticii</i>. No evidence of seroconversion by mice to <i>E. risticii</i> was observed. Two laboratory colonies of <i>Amblyomma variegatum</i> ticks were investigated for their ability to acquire and transmit C. <i>ruminantium</i> and was febrile. Nymphs from both laboratory groups were simultaneously fed on a goat that had been infected with C. <i>ruminantium</i> and was febrile. Engorged nymphs from both groups were replete from feeding on three consecutive days. Nymphs from both groups were then incubated under identical conditions until molting.en
dc.description.degreePh. D.en
dc.format.extentvi, 85 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09202005-090950en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09202005-090950/en
dc.identifier.urihttp://hdl.handle.net/10919/39407en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V856_1990.H335.pdfen
dc.relation.isformatofOCLC# 23174810en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1990.H335en
dc.subject.lcshTick-borne diseasesen
dc.subject.lcshVector-pathogen relationshipsen
dc.titleInvestigations into the vector competency of arthropods for two Ehrlichias: Ehrlichia risticii and Cowdria rumantiumen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineVeterinary Medical Sciencesen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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