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. 2022 Nov 10;2:141. doi: 10.1038/s43856-022-00183-8

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — Map of United States Census tracts colored by their spatial accessibility to COVID-19 vaccine doses. Accessibility scores (A_i) were estimated by the enhanced two-step floating catchment area method. Access strata broadly represent cutoffs suggesting difficulty in reaching herd immunity in 8-months (Jan 1—American Labor Day) with one dose (vaccine desert, A_i < 0.85), immunizing all with one dose (low, 0.85 ≤ A_i < 1.0), difficulty immunizing all with two doses (medium, 1.0 ≤ A_i < 2.0), and sufficient accessibility (high, A_i ≥ 2.0). Under the modeled distribution scheme, if the vaccine sites available to each census tract have a steady supply for the rollout period, they would have a sum (accounting for travel-time decay) of A_i doses per person in their respective weighted catchment areas. No estimates (NA) were provided for non-populated census tracts and those (n = 23) where A_i was undefined.