Objectives: Economic models assessing vaccinations commonly assume that inflation-adjusted vaccine costs are constant over time. This study assessed this assumption using historical vaccine cost data.
Methods: Private sector and CDC contracted vaccine cost data (2001-2023) were collected from the CDC Vaccine Price List and converted to US$2023 to adjust for inflation. Trends in inflation-adjusted costs were described, and the annual percent changes in costs were calculated for each vaccine.
Results: Changes in cost varied by vaccine. The average inflation-adjusted private sector costs increased by 0.9 % (IQR: -0.4 %-2.6 %) and 1.4 % (IQR: -0.4 %-3.2 %) annually among pediatric and adult vaccines, respectively, while CDC contracted costs increased by 0.9 % (IQR: 0.2 %-1.2 %) and 1.0 % (IQR: -0.8 %-2.1 %) annually among pediatric and adult vaccines, respectively.
Conclusions: Inflation-adjusted vaccine costs increased on average since 2001, highlighting limitations of constant cost assumptions. These findings can inform cost-effectiveness analyses of multi-year vaccination programs and policies.
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