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Norval, R.A.I.Peter, T.F.Sonenshine, D.E.Burridge, M.J.[Responses of the ticks Amblyomma hebraeum and A. variegatum to known or potential components of the aggregation-attachment pheromome. III. Aggregation]Responses of the ticks Amblyomma hebraeum and A. variegatum to known or potential components of the aggregation-attachment pheromome. III. Aggregation

A mathematical description of the transmission dynamics of the tick-borne infection Cowdria ruminantium in commercial beef enterprises in Zimbabwe was used to consider the potential impact of a candidate vaccine to prevent heartwater. The important characteristics of the vaccine were (1) a delay ...


O'Callaghan, C.J.Medley, G.F.Peter, T.F.Mahan, S.M.Perry, Brian D.[Predicting the effect of vaccination on the transmission dynamics of heartwater (Cowdria ruminantium infection)]Predicting the effect of vaccination on the transmission dynamics of heartwater (Cowdria ruminantium infection)

Adult Amblyomma hebraeum ticks, the principle vector of heartwater (cowdriosis) of domestic ruminants in southern Africa, were collected in pheromone traps placed in Kruger National Park, an exclusively wildlife sanctuary in South Africa. These ticks transmitted Cowdria ruminantium, the rickettsi...


Peter, T.F.Bryson, N.R.Perry, Brian D.O'Callaghan, C.J.Medley, G.F.Smith, G.E.Mlambo, G.Horak, I.G.Burridge, M.J.Mahan, S.M.[Cowdria ruminantium infection in ticks in the Kruger National Park]Cowdria ruminantium infection in ticks in the Kruger National Park

Heartwater is a severe tick-borne, non-contagious disease of ruminant livestock caused by the rickettsia Cowdria ruminantium, which is endemic in much of sub-Saharan Africa and in the Caribbean. Transmission occurs via ticks of the Amblyomma genus, primarily A. variegatum and A. hebraeum. Intense...


Peter, T.F.O'Callaghan, C.J.Perry, Brian D.Medley, G.F.Mahan, S.[Application of PCR in heartwater epidemiology]Application of PCR in heartwater epidemiology

Heartwater, caused by the rickettsial organism Cowdria ruminantium and transmitted by ticks of the genus Amblyomma, is considered to be the most important tick-borne disease of cattle in southern Africa, and is second only in importance to East Coast fever (theileriosis) in eastern Africa. This p...


O'Callaghan, C.J.Medley, G.F.Peter, T.F.Perry, Brian D.[Modelling the transmission dynamics of Cowdria ruminantium: Supporting the case for endemic stability]Modelling the transmission dynamics of Cowdria ruminantium: Supporting the case for endemic stability

Heartwater, an infectious disease of ruminants caused by the rickettsia Cowdria ruminantium (transmitted by ixodid ticks of the genus Amblyomma and vertically), severely constrains livestock production throughout sub-Saharan Africa. Its epidemiology varies from epidemics with high mortality (on i...


O'Callaghan, C.J.Medley, G.F.Peter, T.F.Mahan, S.M.Perry, Brian D.[Predicting the effect of vaccination of the transmission dynamics of heartwater (Cowdria ruminantium infection)]Predicting the effect of vaccination of the transmission dynamics of heartwater (Cowdria ruminantium infection)

Heartwater is a disease of high mortality in domestic ruminants (cattle, sheep and goats) in sub-Saharan Africa and in the Caribbean. An intracellular rickettsia, Cowdria ruminantium, is the cause of the disease and is transmitted by ticks of the genus Amblyomma. Losses due to heartwater are high...


Peter, T.F.O'Callaghan, C.J.Medley, G.F.Mahan, S.M.Perry, Brian D.[Biological support for modeling the transmission dynamics of cowdriosis]Biological support for modeling the transmission dynamics of cowdriosis

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