Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Associations Between County-level Vaccination Rates and COVID-19 Outcomes Among Medicare Beneficiaries in Early 2021

Publication Date
Lok Wong Samson, Wafa Tarazi, E. John Orav, Steven Sheingold, Nancy De Lew, and Benjamin D. Sommers

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.

Related Products: