Reply to: Subramanian and Kumar, Increases in COVID-19 are unrelated to levels of vaccination across 68 countries and 2947 counties in the United States
In a recent contribution, Subramanian and Kumar (2021) state that increases in COVID-19 are unrelated to vaccination rates both across countries and across U.S. counties. I first discuss several empirical challenges related to the estimation of a meaningful relationship between these two variables which Subramanian and Kumar (2021) do not address. Using the same data sources, I then show that their findings disappear once the longitudinal character of the data is being utilized, underlining the arbitrary character of their result. Finally, I highlight that some of the county-level vaccination rates that Subramanian and Kumar (2021) cite as benchmarks for highly vaccinated locations are implausible and contradicted by additional data sources.