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. 2018 Sep 19;12(9):e0006782.
doi: 10.1371/journal.pntd.0006782. eCollection 2018 Sep.

Improved Methods to Capture the Total Societal Benefits of Zoonotic Disease Control: Demonstrating the Cost-Effectiveness of an Integrated Control Programme for Taenia Solium, Soil Transmitted Helminths and Classical Swine Fever in Northern Lao PDR

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Free PMC article

Improved Methods to Capture the Total Societal Benefits of Zoonotic Disease Control: Demonstrating the Cost-Effectiveness of an Integrated Control Programme for Taenia Solium, Soil Transmitted Helminths and Classical Swine Fever in Northern Lao PDR

Walter O Okello et al. PLoS Negl Trop Dis. .
Free PMC article

Abstract

Background: Control and elimination of zoonotic diseases requires robust information about their effect on both human and livestock health in order to enable policy formulation and the allocation of resources. This study aimed to evaluate the cost-effectiveness of controlling Taenia solium taeniasis/cysticercosis in both humans and pigs, and soil-transmitted helminths (STH) in humans by integrating their control to on-going human and animal health control programmes in northern Lao People's Democratic Republic.

Method: A cross-sectional study was carried out in 49 households, focusing on the prevalence of T. solium taenias/cysticercosis and soil transmitted helminths before and after a twelve month intervention. The village data was collected using a semi-structured questionnaire through a door-to-door survey. The village data was then projected to the wider northern Lao PDR population using stochastic modelling and cost-effectiveness ratio (after aggregating the net cost to capture both human and animal health parameters) and GDP per capita as a threshold, to determine the cost-effectiveness of the integrated control of T. solium taeniasis/ cysticercosis and STH, assuming linear scaling out of the intervention. The zoonotic DALY (zDALY) approach was also used as an alternative method of estimating the cost-effectiveness ratio of controlling T. solium taeniasis/cysticercosis in humans and pigs.

Findings: Using cost-effectiveness analysis after aggregating the net cost and control of T. solium taeniasis/cysticercosis alone as the base case, the study found that simultaneous control of T. solium taeniasis/cysticercosis in humans and pigs, STH in humans and Classical Swine Fever (CSF) in pigs was USD 14 per DALY averted and USD 234 per zDALY averted using zDALY method hence considered highly cost-effective whereas controlling T. solium taeniasis/cysticercosis without incorporating STH and CSF was the least cost-effective (USD 3,672 per DALY averted). Additionally, the cost-effectiveness of controlling T. solium taeniasis/cysticercosis in people and pigs using zDALY as an alternative method was USD 3,662 per zDALY averted which was quite close to our findings using the aggregate net cost method.

Conclusion: The study showed that control of T. solium taeniasis/cysticercosis alone in humans and pigs is not cost-effective in northern Lao PDR whereas control of STH is. Consequently, integrating T. solium taeniasis/cysticercosis control with other cost-effective programmes such as STH and CSF markedly improved the cost-effectiveness of the intervention. This is especially important in low resource countries where control of zoonotic neglected tropical diseases could be integrated with the human and animal health sectors to optimize use of the limited resources.

Trial registration: Australia New Zealand Clinical Trials Registry (ANZCTR) ACTRN12614001067662.

Conflict of interest statement

AP consultants was not involved in any way in the actual implementation of the project nor does it produce any commercial products nor did it fund any part of the project and none of the co-authors are employed or affiliated with this company except Dr Alexandra Shaw who declares no competing interests.

Figures

Fig 1
Fig 1. Pre and post intervention pig numbers in the target area.
Fig 2
Fig 2. Sensitivity analysis of the neurocysticercosis associated DALY estimate for Lao.
Epilepsy is denoted as E and persons with epilepsy as PWE in the diagram.

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Grant support

This research was funded by the Australian Centre for International Agricultural Research (ACIAR) Animal Health Programme, grant AH2009/001 and AH/2009/019. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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