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Cost-effectiveness of the introduction of a pre-erythrocytic malaria vaccine into the expanded program on immunization in Sub-Saharan Africa : analysis of uncertainties using a stochastic individual-based simulation model of Plasmodium falciparum malaria

Maire, N. and Shillcutt, S. D. and Walker, D. G. and Tediosi, F. and Smith, T. A.. (2011) Cost-effectiveness of the introduction of a pre-erythrocytic malaria vaccine into the expanded program on immunization in Sub-Saharan Africa : analysis of uncertainties using a stochastic individual-based simulation model of Plasmodium falciparum malaria. Value in health : the journal of the International Society for Pharmacoeconomics and Outcomes Research, Vol. 14, H. 8. pp. 1028-1038.

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Official URL: http://edoc.unibas.ch/dok/A6002153

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Abstract

OBJECTIVE: To evaluate the cost-effectiveness of introducing the RTS,S malaria vaccine into the Expanded Programme on Immunization (EPI) in Sub-Saharan Africa (SSA), the contributions of different sources of uncertainty, and the associated expected value of perfect information (EVPI). METHODS: Vaccination was simulated in populations of 100,000 people at 10 different entomological inoculation rates (EIRs), using an existing stochastic model and a 10-year time horizon. Incremental cost-effectiveness ratios (ICERs) and EVPI were computed from weighted averages of outputs using two different assignments of the EIR distribution in 2007. Uncertainty was evaluated by resampling of epidemiological, vaccination, and health systems model parameters. RESULTS: Health benefits were predicted consistently only at low transmission, and program costs always substantially exceeded case management savings. Optimal cost-effectiveness was at EIR of about 10 infectious bites per annum (ibpa). Main contributors to ICER uncertainty were uncertainty in transmission intensity, price per vaccine dose, decay rate of the vaccine effect, degree of homogeneity in host response, and some epidemiological model parameters. Other health system costs were unimportant. With a ceiling ratio of 207 international dollars per disability-adjusted life-year averted, 52.4% of parameterizations predicted cost-effectiveness in the primary analysis. CONCLUSIONS: Cost-effectiveness of RTS,S will be maximal in low endemicity settings (EIR 2-20 ibpa). Widespread deployment of other transmission-reducing interventions will thus improve cost-effectiveness, suggesting a selective introduction strategy. EVPI is substantial. Accrual of up-to-date information on local endemicity to guide deployment decisions would be highly efficient
Faculties and Departments:09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Epidemiology and Public Health (EPH) > Infectious Disease Modelling > Epidemiology and Transmission Dynamics (Smith)
UniBasel Contributors:Smith, Thomas A. and Tediosi, Fabrizio and Maire, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:1098-3015
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:08 Nov 2012 16:23
Deposited On:08 Nov 2012 16:19

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