The purpose of this study is to identify associations between COVID-19 infections, hospitalizations, and deaths among Medicare fee-for-service (FFS) beneficiaries and the proportion of the population fully vaccinated at the county-level between January and May 2021. We do so by using a combination of person-level Medicare FFS claims and Centers for Disease Control and Prevention (CDC) data on county-level vaccination rates. Based on these results, we then estimated the net reduction in infections, hospitalizations, and deaths among all 62.7 million Medicare beneficiaries associated with the first 5 months of the U.S.’s COVID-19 vaccine roll-out. Our results indicate that COVID-19 vaccinations from January until May 2021 were associated with an estimated reduction of more than 265,000 COVID-19 infections and nearly 39,000 deaths among Medicare beneficiaries.
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