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An Optimisation Model for Use of the Vi Polysaccharide Vaccine to Prevent Typhoid in Developing Countries


  • Donald T. Lauria
  • Brian Maskery
  • Christine Poulos
  • Dale Whittington


This article considers the investment case for using the Vi polysaccharide vaccine (Vi) in developing countries from two perspectives: reducing typhoid cases and limiting new health care spending. Consumer demand functions that predict probabilities of adults and children purchasing typhoid vaccinations at different prices are incorporated in a formal mathematical model. This optimisation model solves for the optimal vaccine prices to charge adults and children to maximise the number of typhoid cases avoided subject to the constraint that the sum of 1) vaccination revenues, 2) the public savings from avoided cases, and 3) an external (e.g., donor) contribution (if any), is sufficient to pay for the costs of the vaccination program. Using values from the recent literature for South and Southeast Asia for typhoid incidence, Vi vaccine effectiveness, public cost of illness, and vaccination program cost, three mass vaccination policy alternatives are considered - charging adults and children different (optimal) prices, charging uniform prices, and providing free vaccines. Assuming differential pricing is politically feasible, the vaccine price for children should be zero (because their incidence is much higher than adults), and fees for adults should cover most of costs of the vaccination program (because the savings from reduced public sector treatment are small). Equal prices for children and adults produce very similar results to the optimal solution. Alternatively, if vaccines are free, the number of cases is not significantly reduced compared to either pricing policy, but a large external financial contribution would be required.

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  • Donald T. Lauria & Brian Maskery & Christine Poulos & Dale Whittington, 2008. "An Optimisation Model for Use of the Vi Polysaccharide Vaccine to Prevent Typhoid in Developing Countries," Global Development Institute Working Paper Series 1808, GDI, The University of Manchester.
  • Handle: RePEc:bwp:bwppap:1808

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    1. Suraratdecha, Chutima & Ainsworth, Martha & Tangcharoensathien, Viroj & Whittington, Dale, 2005. "The private demand for an AIDS vaccine in Thailand," Health Policy, Elsevier, vol. 71(3), pages 271-287, March.
    2. Francis, Peter J., 1997. "Dynamic epidemiology and the market for vaccinations," Journal of Public Economics, Elsevier, vol. 63(3), pages 383-406, February.
    3. Boulier Bryan L. & Datta Tejwant S. & Goldfarb Robert S, 2007. "Vaccination Externalities," The B.E. Journal of Economic Analysis & Policy, De Gruyter, vol. 7(1), pages 1-27, May.
    4. Cropper, Maureen L. & Haile, Mitiku & Lampietti, Julian & Poulos, Christine & Whittington, Dale, 2004. "The demand for a malaria vaccine: evidence from Ethiopia," Journal of Development Economics, Elsevier, vol. 75(1), pages 303-318, October.
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