Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines

R.J. Dobson; A.P. Dargantes; RT. Mercado; S.A. Reid

doi:10.1016/j.ijpara.2009.02.013

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Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines

Journal article

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Peer reviewed

Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines

R.J. Dobson, A.P. Dargantes, RT. Mercado and S.A. Reid

International Journal for Parasitology, Vol.39(10), pp.1115-1123

2009

DOI: https://doi.org/10.1016/j.ijpara.2009.02.013

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Abstract

Simple demographic and infectious disease models of buffaloes and other domestic hosts for animal trypanosomosis (surra) caused by Trypanosoma evansi were developed. The animal models contained deterministic and stochastic elements and were linked to simulate the benefit of control regimes for surra in village domestic animal populations in Mindanao, Philippines. The impact of the disease on host fertility and mortality were key factors in determining the economic losses and net-benefit from the control regimes. If using a high (99%) efficacy drug in surra-moderate to high risk areas, then treating all animals twice each year yielded low prevalence in 2 years; targeted treatment of clinically sick animals, constantly monitored (monthly), required 75% fewer treatments but took longer to reach a low prevalence than treating all animals twice each year. At high drug efficacy both of these treatment strategies increased the benefit over untreated animals by 81%. If drug efficacy declined then the benefit obtained from twice yearly treatment of all animals declined rapidly compared with regular monitoring and targeting treatment to clinically sick animals. The current control regimen applied in the Philippines of annual sero-testing for surra and only treating sero-positive animals provided the lowest net-benefit of all the control options simulated and would not be regarded as effective control. The total net-benefit from effective surra control for a typical village in a moderate/high risk area was 7.9 million pesos per annum (US $158,000). The value added to buffaloes, cattle, horses, goats/sheep and pigs as a result of this control was US $88, $84, $151, $7, $114 per animal/year, respectively

Details

Title: Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines
Authors/Creators: R.J. Dobson (Author/Creator) - Murdoch University
A.P. Dargantes (Author/Creator) - Central Mindanao University
RT. Mercado (Author/Creator) - Department of Agriculture, Region X1, Davao City 8000, Philippines
S.A. Reid (Author/Creator) - Murdoch University
Publication Details: International Journal for Parasitology, Vol.39(10), pp.1115-1123
Publisher: Elsevier BV
Identifiers: 991005541006907891
Copyright: © 2009 Australian Society for Parasitology Inc
Murdoch Affiliation: School of Veterinary and Biomedical Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 1 Clinical & Life Sciences; 1.261 Parasitology - Trypanosoma & Leishmania; 1.261.596 Trypanosoma Biology
Web Of Science research areas: Parasitology
ESI research areas: Microbiology