https://www.stlouisfed.org/on-the-economy/2022/sep/income-inequality-vaccinatio… Created Tue, 13/09/2022 - 19:30 Updated Tue, 13/09/2022 - 19:30 The gap in COVID-19 death rates between the lowest-income U.S. counties and the highest-income counties widened in 2021 with the availability of vaccines.