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 ...
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]
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The economics of integrated tick and tick-borne disease control on commercial farms in Zimbabwe
The association between serum antibody titres to Theileria parva in calves and potential explanatory factors were examined in a longitudinal observational study that was conducted in 5 cohorts of female calves with a total of 225 calves on 188 smallholder dairy farms. The farms were distributed i...
Gitau, G.K.
,
McDermott, John J.
,
Perry, Brian D.
,
[Factors associated with Theileria parva infections in small-holder dairy farms in Murang'a District, Kenya]
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Factors associated with Theileria parva infections in small-holder dairy farms in Murang'a District, Kenya
The transmission of Theileria parva by nymphal and adult Rhipicephalus appendiculatus was compared by the assessment of salivary gland infections in tick batches fed on the same group of infected cattle at the same time. When larval and nymphal R. appendiculatus Muguga ticks were fed concurrently...
Ochanda, H.
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Young, A.S.
,
Wells, C.
,
Medley, G.F.
,
Perry, Brian D.
,
[Comparison of the transmission of Theileria parva between different instars of Rhipicephalus appendiculatus]
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Comparison of the transmission of Theileria parva between different instars of Rhipicephalus appendiculatus
Large databases with multiple variables, selected because they are available and might provide an insight into establishing causal relationships, are often difficult to analyse and interpret because of multicollinearity. The objective of this study was to reduce the dimensionality of a multivaria...
Duchateau, L.
,
Kruska, R.L.
,
Perry, Brian D.
,
[Reducing a spatial database to its effective dimensionality for logistic - regression analysis of incidence of livestock disease]
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Reducing a spatial database to its effective dimensionality for logistic - regression analysis of incidence of livestock disease
This paper reviews the past contributions of epidemiology and economics to the control of tick-borne infections of cattle in Africa. The factors affecting successful and unsuccessful control are evaluated on a gographical and on a production systems basis, with particular reference to Theileria p...
Perry, Brian D.
,
Young, A.S.
,
[The past and future roles of epidemiology and economics in the control of tick-borne diseases of livestock in Africa: The case of theileriosis]
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The past and future roles of epidemiology and economics in the control of tick-borne diseases of livestock in Africa: The case of theileriosis
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...
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]
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The effect of subclinical experimental Cowdria ruminantium infection in ewes on the growth and milk consumption of pre-weaning lambs
Kruska, R.L.
,
Perry, Brian D.
,
[Evaluation of grazing lands of Zimbabwe using AVHRR normalised difference vegetation index]
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Evaluation of grazing lands of Zimbabwe using AVHRR normalised difference vegetation index
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...
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]
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Prevalence of Cowdria ruminantium infection in Amblyomma
hebraeum ticks from heartwater-endemic areas of Zimbabwe
Honhold, N.
,
Hill, F.W.G.
,
Knottenbelt, D.C.
,
Perry, Brian D.
,
Morton, D.
,
[Reproduction in female cattle in a communal farming area of Zimbabwe]
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Reproduction in female cattle in a communal farming area of Zimbabwe
Perry, Brian D.
,
Young, A.S.
,
[The naming game. The changing fortunes of East Coast fever and Theileria parva]
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The naming game. The changing fortunes of East Coast fever and Theileria parva