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

Show simple item record Yonow, T. Brewster, C.C. Allen, J.C. Meltzer, M.I.
dc.contributor.editor Verwoerd, Daniel Wynand 2012-12-12T07:30:23Z 2012-12-12T07:30:23Z 2012 1998
dc.description The 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.abstract We 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.sponsorship UF/USAID/SADC Heartwater Research Project. en_US
dc.identifier.citation Yonow, 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.issn 0330-2465
dc.language.iso en en_US
dc.publisher Published by the Agricultural Research Council, Onderstepoort Veterinary Institute en_US
dc.rights © ARC-Onderstepoort (original). © University of Pretoria. Dept of Library Services (digital). en_US
dc.subject Veterinary medicine en_US
dc.subject Amblyomma hebraeum en_US
dc.subject Cowdria ruminantium en_US
dc.subject Epidemiology en_US
dc.subject Heartwater en_US
dc.subject Modelling en_US
dc.subject Ticks en_US
dc.subject.lcsh Veterinary medicine -- South Africa
dc.title Models for heartwater epidemiology: practical implications and suggestions for future research en_US
dc.type Article en_US

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