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Journal Article 2001

Autor: Peter, T.F. O'Callaghan, C.J. Medley, G.F. Perry, Brian D. Semu, S.M. Mahan, S.M.

The indirect MAP 1B ELISA based on the recombinant MAP 1B fragment of the immunodominant MAP 1 protein of Ehrlichia ruminantium is considered to be the most sensitive and specific assay for the serodiagnosis of heartwater. In this study, we evaluated its reliability in detecting exposure to E....

Enlace original: https://cgspace.cgiar.org/handle/10568/32906

Investigación en Agricultura
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Peter, T.F. ,  O'Callaghan, C.J. ,  Medley, G.F. ,  Perry, Brian D. ,  Semu, S.M. ,  Mahan, S.M. ,  [Population-based evaluation of the Ehrlichia ruminantium MAP 1B indirect ELISA] ,  Population-based evaluation of the Ehrlichia ruminantium MAP 1B indirect ELISA
Journal Article 1999

Autor: O'Callaghan, C.J. Medley, G.F. Peter, T.F. Mahan, S.M. Perry, Brian D.

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 ...

Enlace original: https://cgspace.cgiar.org/handle/10568/33115

Investigación en Agricultura
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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)
Journal Article 1999

Autor: Mukhebi, A.W. Chamboko, Tafireyi O'Callaghan, C.J. Peter, T.F. Kruska, R.L. Medley, G.F. Mahan, S.M. Perry, Brian D.

Heartwater, caused by the rickettsial organism Cowdria ruminantium, is a serious constraint to livestock development in much of sub-Saharan Africa. Traditionally, the disease has been controlled by the use of chemical acaricides to control the vector tick. The University of Florida/USAID-supporte...

Enlace original: https://cgspace.cgiar.org/handle/10568/33114

Investigación en Agricultura
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Mukhebi, A.W. ,  Chamboko, Tafireyi ,  O'Callaghan, C.J. ,  Peter, T.F. ,  Kruska, R.L. ,  Medley, G.F. ,  Mahan, S.M. ,  Perry, Brian D. ,  [An assessment of the economic impact of heartwater (Cowdria ruminantium infection) and its control in Zimbabwe] ,  An assessment of the economic impact of heartwater (Cowdria ruminantium infection) and its control in Zimbabwe
Journal Article 1999

Autor: 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.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/29920

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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
Journal Article 1999

Autor: Peter, T.F. Perry, Brian D. O'Callaghan, C.J. Medley, G.F. Mlambo, G. Barbet, A.F. Mahan, S.M.

Analysis of the transmission dynamics of Cowdria ruminantium, the tick-borne rickettsial agent of heartwater in ruminants, requires accurate measures of infection in vector populations. To obtain these, Amblyomma hebraeum ticks were collected at two heartwater-endemic locations in the lowveld and...

Enlace original: https://cgspace.cgiar.org/handle/10568/28497

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Peter, T.F. ,  Perry, Brian D. ,  O'Callaghan, C.J. ,  Medley, G.F. ,  Mlambo, G. ,  Barbet, A.F. ,  Mahan, S.M. ,  [Prevalence of Cowdria ruminantium infection in Amblyomma hebraeum ticks from heartwater-endemic areas of Zimbabwe] ,  Prevalence of Cowdria ruminantium infection in Amblyomma hebraeum ticks from heartwater-endemic areas of Zimbabwe
Journal Article 1999

Autor: Chamboko, Tafireyi Mukhebi, A.W. O'Callaghan, C.J. Peter, T.F. Kruska, R.L. Medley, G.F. Mahan, S.M. Perry, Brian D.

In order to assess the economic impact of heartwater (Cowdria ruminantium infection) and model the impact of improved vaccines against the disease, a field study was conducted to provide data on livestock productivity indicators in Zimbabwe. Cross-sectional studies were performed in the two main ...

Enlace original: https://cgspace.cgiar.org/handle/10568/29589

Investigación en Agricultura
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Chamboko, Tafireyi ,  Mukhebi, A.W. ,  O'Callaghan, C.J. ,  Peter, T.F. ,  Kruska, R.L. ,  Medley, G.F. ,  Mahan, S.M. ,  Perry, Brian D. ,  [Heartwater and the economics of livestock production on large scale commercial and smallholder farms in Zimbabwe] ,  Heartwater and the economics of livestock production on large scale commercial and smallholder farms in Zimbabwe
Journal Article 1998

Autor: Peter, T.F. Perry, Brian D. O'Callaghan, C.J. Medley, G.F. Shumba, W. Madzima, W. Burridge, M.J. Mahan, S.M.

The tick vectors of heartwater (Cowdria ruminantium infection) in Zimbabwe, Amblyomma hebraeum and Amblyomma variegatum, historically were believed to be confined to the low-lying regions of the south and north-west of the country. However, country-wide surveys performed in 1975-1980 and 1988-199...

Enlace original: https://cgspace.cgiar.org/handle/10568/32908

Investigación en Agricultura
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Peter, T.F. ,  Perry, Brian D. ,  O'Callaghan, C.J. ,  Medley, G.F. ,  Shumba, W. ,  Madzima, W. ,  Burridge, M.J. ,  Mahan, S.M. ,  [Distributions of the vectors of heartwater, Amblyomma hebraeum and amblyomma variegatum (Acari: Ixodidae), in Zimbabwe] ,  Distributions of the vectors of heartwater, Amblyomma hebraeum and amblyomma variegatum (Acari: Ixodidae), in Zimbabwe
Conference Paper 1997

Autor: O'Callaghan, C.J. Medley, G.F. Peter, T.F. Perry, Brian D.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/50860

Investigación en Agricultura
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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
Conference Paper 2000

Autor: O'Callaghan, C.J. Medley, G.F. Peter, T.F. Mahan, S.M. Perry, Brian D.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/50957

Investigación en Agricultura
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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)
Conference Paper 2000

Autor: Peter, T.F. O'Callaghan, C.J. Medley, G.F. Mahan, S.M. Perry, Brian D.

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/50223

Investigación en Agricultura
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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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