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Journal Article 1999

Autor: Martínez, T.A. Meltzer, M.I. Perry, Brian D. Burridge, M.J. Mahan, S.M.

This study documented the effect on the productivity of Dorper-Merino cross ewes when they became infected with Cowdria ruminantium as would occur in an endemically stable state. A flock of 152 breeding ewes was randomly divided into two matched groups. One group was infected on multiple occasion...

Enlace original: https://cgspace.cgiar.org/handle/10568/29502

Investigación en Agricultura
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Martínez, T.A. ,  Meltzer, M.I. ,  Perry, Brian D. ,  Burridge, M.J. ,  Mahan, S.M. ,  [The effect of subclinical experimental Cowdria ruminantium infection on the health and reproductive performance of breeding ewes] ,  The effect of subclinical experimental Cowdria ruminantium infection on the health and reproductive performance of breeding ewes
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: Peter, T.F. Anderson, E.C. Burridge, M.J. Perry, Brian D. Mahan, S.M.

Three species of wild African ruminants. impala (Aepyceros melampus), sable (Hippotragus equinus, and tsessebe (Damaliscus lunatus), were experimentally inoculated with in vitro culture-derived Cowdria ruminantium organisms, the tick-borne causative agent of heartwater in domestic ruminants, to d...

Enlace original: https://cgspace.cgiar.org/handle/10568/28944

Investigación en Agricultura
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Peter, T.F. ,  Anderson, E.C. ,  Burridge, M.J. ,  Perry, Brian D. ,  Mahan, S.M. ,  [Susceptibility and carrier status of impala, sable and tsessebe for Cowdria ruminantium infection (heartwater)] ,  Susceptibility and carrier status of impala, sable and tsessebe for Cowdria ruminantium infection (heartwater)
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: Chamboko, Tafireyi Mukhebi, A.W. Callaghan, C.J.O. Peter, T.F. Kruska, R.L. Medley, G.F. Mahan, S.M. Perry, Brian D.

As part of a series of studies associated with the development of improved vaccines for heartwater (a tick-borne disease of ruminant livestock caused by Cowdria ruminantium), field surveys were carried out to assess losses associated with the disease and the costs associated with controlling it i...

Enlace original: https://cgspace.cgiar.org/handle/10568/33113

Investigación en Agricultura
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Chamboko, Tafireyi ,  Mukhebi, A.W. ,  Callaghan, C.J.O. ,  Peter, T.F. ,  Kruska, R.L. ,  Medley, G.F. ,  Mahan, S.M. ,  Perry, Brian D. ,  [The control of heartwater on large-scale commercial and smallholder farms in Zimbabwe] ,  The control of heartwater on large-scale commercial and smallholder farms in Zimbabwe
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

Investigación en Agricultura
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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: Martínez, T.A. Meltzer, M.I. Perry, Brian D. Burridge, M.J. Mahan, S.M.

An alternative control option for heartwater (Cowdria ruminatium infection) is the establishment and maintenance of endemic stability which would lessen the existing dependence on acaricides. In an endemically stable state, animals become infected by vaccination or natural challenge at an early a...

Enlace original: https://cgspace.cgiar.org/handle/10568/29501

Investigación en Agricultura
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Martínez, T.A. ,  Meltzer, M.I. ,  Perry, Brian D. ,  Burridge, M.J. ,  Mahan, S.M. ,  [The effect of subclinical experimental Cowdria ruminantium infection in ewes on the growth and milk consumption of pre-weaning lambs] ,  The effect of subclinical experimental Cowdria ruminantium infection in ewes on the growth and milk consumption of pre-weaning lambs
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

Investigación en Agricultura
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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
Enlace permanente
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

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