Consumer willingness to pay for a hypothetical chikungunya vaccine in Brazil and the implications

Sarmento, Túlio Tadeu Rocha and Godói, Isabella Piassi and Reis, Edna Afonso and Godman, Brian and Ruas, Cristina Mariano (2022) Consumer willingness to pay for a hypothetical chikungunya vaccine in Brazil and the implications. Expert Review of Pharmacoeconomics and Outcomes Research, 22 (3). pp. 513-520. ISSN 1473-7167 (https://doi.org/10.1080/14737167.2020.1703181)

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Abstract

Background: Chikungunya fever is an important infectious disease transmitted by the bite of the mosquitoes. Information about consumers' willingness to pay (WTP) for a hypothetical vaccine can help with future discussions about its possible price. Methods: A cross-sectional study conducted among residents of Minas Gerais, Brazil, regarding their WTP for a hypothetical chikungunya vaccine defined by the authors as having a mean effective protection of 80%. Results: We interviewed 496 individuals. Among these, 23 were excluded from the analysis. Most of the respondents were female (57.3%), had completed at least high school (90.7%), were employed (87.7%) and had private health insurance (62.6%). The median value of the WTP was US$ 31.17 (120.00 BRL) for a unique dose vaccine. The WTP showed a statistical significant correlation with monthly family income and access to private health insurance. Conclusion: This study can contribute to decision-making about potential prices for a chikungunya vaccine once it becomes available in Brazil. We demonstrated the relevance of the anchoring effect as a possible influence applied to the maximum value of the WTP associated with respondents’ preference for a new vaccine. Finally, we encourage the development of a chikungunya virus vaccine to benefit the Brazilian population.

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