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Journal Article 1996

Autor: Meltzer, M.I. Perry, Brian D. Donachie, P.L.

A postal questionnaire asking for data concerning heartwater deaths was sent to all large-scale commercial farmers in Zimbabwe's lowveld, where heartwater is endemic. One hundred and fifty returns (24 percent return rate) provided usable data, with 85 farms (57 percent of sample) reporting heartw...

Enlace original: https://cgspace.cgiar.org/handle/10568/29526

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Meltzer, M.I. ,  Perry, Brian D. ,  Donachie, P.L. ,  [Mortality percentages related to heartwater and the economic impact of heartwater disease on large-scale commercial farms in Zimbabwe] ,  Mortality percentages related to heartwater and the economic impact of heartwater disease on large-scale commercial farms in Zimbabwe
Journal Article 1992

Autor: Norval, R.A.I. Perry, Brian D. Hargreaves, S.K.

Compulsory short-interval dipping of cattle for tick control has been enforced in Zimbabwe since the early part of this century. Intensive dipping was initially introduced as a measure to control East Coast fever (ECF), following its introduction from eastern Africa. Dipping was subsequently foun...

Enlace original: https://cgspace.cgiar.org/handle/10568/29961

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Norval, R.A.I. ,  Perry, Brian D. ,  Hargreaves, S.K. ,  [Tick and tick-borne disease control in Zimbabwe: What might the future hold] ,  Tick and tick-borne disease control in Zimbabwe: What might the future hold
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

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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

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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
Conference Paper 2000

Autor: Minjauw, B. Perry, Brian D. Randolph, Thomas F. McDermott, John J. Kruska, R.L.

Heartwater, transmitted by Amblyomma spp., is considered one of the most important tick-borne diseases of cattle, goats and sheep in southern Africa, causing considerable losses through mortality and control costs. In support of a project developing a new inactivated vaccine, we have undertaken, ...

Enlace original: https://cgspace.cgiar.org/handle/10568/50646

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Minjauw, B. ,  Perry, Brian D. ,  Randolph, Thomas F. ,  McDermott, John J. ,  Kruska, R.L. ,  [Identification of circumstances in which heartwater has a major economic impact for the livestock industry in Southern Africa] ,  Identification of circumstances in which heartwater has a major economic impact for the livestock industry in Southern Africa
Conference Paper 1997

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

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...

Enlace original: https://cgspace.cgiar.org/handle/10568/50184

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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
Conference Paper 1997

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

Heartwater, a disease of ruminants caused by the rickettsia Cowdria ruminantium and transmitted by ticks of the genus Amblyomma, is a significant cause of productivity losses in cattle, sheep and goats in most of sub-Saharan Africa. In southern Africa, the vector of C. ruminantium is A. hebraeum....

Enlace original: https://cgspace.cgiar.org/handle/10568/50115

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Perry, Brian D. ,  Chamboko, Tafireyi ,  Mahan, S. ,  Medley, G.F. ,  Mukhebi, A.W. ,  O'Callaghan, C.J. ,  Peter, T.F. ,  [A study of the effects of heartwater and its control on livestock productivity and economics in Zimbabwe] ,  A study of the effects of heartwater and its control on livestock productivity and economics in 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

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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

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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

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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

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