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Self-enforcing regional vaccination agreements.

Petra Klepac1, Itamar Megiddo2, Bryan T Grenfell3

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Summary

Forming voluntary vaccination coalitions helps countries achieve higher immunization coverage affordably. These coalitions deter free-riding, ensuring more consistent vaccination rates across regions, especially for countries with differing economic or epidemiological factors.

Keywords:
SIR modelepidemic dynamicsmetapopulationregional cooperationtransboundary movement

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Area of Science:

  • Epidemiology
  • Game Theory
  • Public Health Policy

Background:

  • Infectious disease immunization is a global challenge requiring international cooperation.
  • Individual countries independently set vaccination strategies, risking suboptimal global coverage due to population mobility and free-riding.
  • Lack of a global body to enforce universal vaccination strategies necessitates alternative coordination mechanisms.

Purpose of the Study:

  • To investigate if voluntary coalitions can overcome free-riding issues in vaccination.
  • To identify conditions under which vaccination coalitions are stable and self-enforcing.
  • To assess the cost-effectiveness and coverage consistency of cooperative vaccination strategies.

Main Methods:

  • Utilizing dynamic epidemiological models.
  • Employing a game-theoretic framework to analyze coalition stability.
  • Simulating vaccination strategies under different coalition scenarios.

Main Results:

  • Coalitions enable countries to achieve significantly higher vaccination coverage at a lower cost compared to independent action.
  • Coalitions are successful when they possess mechanisms to deter free-riding.
  • Cooperative strategies lead to more regionally consistent vaccination coverage, particularly among countries with economic or epidemiological asymmetries.

Conclusions:

  • Voluntary coalitions offer a viable solution for enhancing global immunization efforts.
  • Effective coalition design must include strategies to prevent free-riding.
  • International cooperation through coalitions can lead to more equitable and efficient disease control.