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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 1989

Autor: Conrad, P.A. Ole-MoiYoi, O.K. Baldwin, C.L. Dolan, T.T. O'Callaghan, C.J. Njamunggeh, R.E.G. Grootenhuis, J.G. Stagg, D.A. Leitch, B.L. Young, A.S.
Enlace original: https://cgspace.cgiar.org/handle/10568/29434

Investigación en Agricultura
DNA
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Conrad, P.A. ,  Ole-MoiYoi, O.K. ,  Baldwin, C.L. ,  Dolan, T.T. ,  O'Callaghan, C.J. ,  Njamunggeh, R.E.G. ,  Grootenhuis, J.G. ,  Stagg, D.A. ,  Leitch, B.L. ,  Young, A.S. ,  [Characterization of buffalo-derived theilerial parasites with monoclonal antibodies and DNA probes] ,  Characterization of buffalo-derived theilerial parasites with monoclonal antibodies and DNA probes
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
Enlace permanente
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 1998

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

The authors highlight the reliance on repeated natural infections by tickborne pathogens to maintain immunity in immunized herds. That incidence of clinical heartwater in cattle, caused by Cowdria ruminantium, is low while intensive acaricide use interrupts transmission of pathogens. Evidence is ...

Enlace original: https://cgspace.cgiar.org/handle/10568/29964

Investigación en Agricultura
Enlace permanente
Perry, Brian D. ,  Chamboko, Tafireyi ,  Mahan, S.M. ,  Medley, G.F. ,  Minjauw, B. ,  O'Callaghan, C.J. ,  Peter, T.F. ,  [The economics of integrated tick and tick-borne disease control on commercial farms in Zimbabwe] ,  The economics of integrated tick and tick-borne disease control on commercial farms in Zimbabwe
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
Enlace permanente
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 1994

Autor: O'Callaghan, C.J. McDermott, John J. Katende, J.M. Adams, J.E. Perry, Brian D. Young, A.S.
Enlace original: https://cgspace.cgiar.org/handle/10568/29151

Investigación en Agricultura
Enlace permanente
O'Callaghan, C.J. ,  McDermott, John J. ,  Katende, J.M. ,  Adams, J.E. ,  Perry, Brian D. ,  Young, A.S. ,  [Analysis of longitudinal serological data for Theileria parva] ,  Analysis of longitudinal serological data for Theileria parva
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
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
Enlace permanente
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

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