Models for heartwater epidemiology: practical implications and suggestions for future research

dc.contributor.authorYonow, T.
dc.contributor.authorBrewster, C.C.
dc.contributor.authorAllen, J.C.
dc.contributor.authorMeltzer, M.I.
dc.contributor.editorVerwoerd, Daniel Wynand
dc.date.accessioned2012-12-12T07:30:23Z
dc.date.available2012-12-12T07:30:23Z
dc.date.created2012
dc.date.issued1998
dc.descriptionThe articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat X Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.en_US
dc.description.abstractWe present a simple model of the dynamics of heartwater that we use to explore and better understand various aspects of this disease. We adapted the Ross-Macdonald model for malaria epidemiology so that we could consider both host and vector populations, and evaluate the interactions between the two. We then use two more biologically detailed models to examine heartwater epidemiology. The first includes a carrier state and host mortality, and the second includes density dependence. The results from all three models indicate that a stable equilibrium with high disease levels is probably the standard situation for heartwater (R<sub>0</sub> between 5,7 and 22,4). More than 80% of cattle become infected with heartwater if only 12% of infected tick bites produce an infection in cattle, if tick burdens are as low as only five ticks per host per day, or if tick lifespans are as short as 7 d. A host recovery rate of 30 d results in over 50% of the cattle becoming infected with heartwater. Our analyses indicate that it is quite difficult to prevent the establishment and maintenance of high levels of heartwater in a herd, thereby supporting previous suggestions that any attempts at controlling this disease through stringent tick control regimens are not warranted.en_US
dc.description.sponsorshipUF/USAID/SADC Heartwater Research Project.en_US
dc.identifier.citationYonow, T, Brewster, CC, Allen, JC & Meltzer, MI 1998, 'Models for heartwater epidemiology: practical implications and suggestions for future research’. Onderstepoort Journal of Veterinary Research, vol. 65, no. 4, pp. 263-273.en_US
dc.identifier.issn0330-2465
dc.identifier.urihttp://hdl.handle.net/2263/20724
dc.language.isoenen_US
dc.publisherPublished by the Agricultural Research Council, Onderstepoort Veterinary Instituteen_US
dc.rights© ARC-Onderstepoort (original). © University of Pretoria. Dept of Library Services (digital).en_US
dc.subjectVeterinary medicineen_US
dc.subjectAmblyomma hebraeumen_US
dc.subjectCowdria ruminantiumen_US
dc.subjectEpidemiologyen_US
dc.subjectHeartwateren_US
dc.subjectModellingen_US
dc.subjectTicksen_US
dc.subject.lcshVeterinary medicine -- South Africa
dc.titleModels for heartwater epidemiology: practical implications and suggestions for future researchen_US
dc.typeArticleen_US

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