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

Dobson, R. J., Dargantes, A. P., Mercado, R. T. and Reid, S. A. (2009) Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines. International Journal for Parasitology, 39 10: 1115-1123. doi:10.1016/j.ijpara.2009.02.013


Author Dobson, R. J.
Dargantes, A. P.
Mercado, R. T.
Reid, S. A.
Title Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines
Formatted title
Models for Trypanosoma evansi (surra), its control and economic impact on small-hold livestock owners in the Philippines
Journal name International Journal for Parasitology   Check publisher's open access policy
ISSN 0020-7519
1879-0135
Publication date 2009-01-01
Sub-type Article (original research)
DOI 10.1016/j.ijpara.2009.02.013
Volume 39
Issue 10
Start page 1115
End page 1123
Total pages 9
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
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.
Keyword Control strategies
Cost benefit
Infectious disease model
Philippines
Targeted treatment
Trypanosoma evansi
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Public Health Publications
 
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