First-dose COVID-19 vaccine uptake,∗ by social vulnerability index (SVI) theme† and tertile,‡ among residents and staff members of assisted living (A and B) and other residential care (C and D) communities—Pharmacy Partnership for Long-Term Care Program, December 2020–April 2021. ∗Includes cumulative first-dose vaccine uptake as of April 21, 2021. †SVI ranks counties according to 15 social factors (indicators): (1) percentage of persons with incomes below poverty threshold, (2) percentage of civilian population (aged ≥16 years) that is unemployed, (3) per capita income, (4) percentage of persons aged ≥25 years with no high school diploma, (5) percentage of persons aged ≥65 years, (6) percentage of persons aged ≤17 years, (7) percentage of civilian noninstitutionalized population with a disability, (8) percentage of single-parent households with children aged <18 years, (9) percentage of persons who are racial/ethnic minorities (all persons except non-Hispanic White), (10) percentage of persons aged ≥5 years who speak English “less than well,” (11) percentage of housing structures with ≥10 units (multiunit housing), (12) percentage of housing structures that are mobile homes, (13) percentage households with more persons than rooms (crowding), (14) percentage of households with no vehicle available, and (15) percentage of persons in group quarters. Estimates are created using 2014-2018 (5-year) data from the American Community Survey. The 15 indicators are categorized into 4 themes: (1) socioeconomic status (indicators 1-4), (2) household composition and disability (indicators 5-8), (3) racial/ethnic minority status and language English (indicators 9 and 10), and (4) housing type and transportation (indicators 11-15). Additional details are available at https://www.atsdr.cdc.gov/placeandhealth/svi/documentation/SVI_documentation_2018.html. ‡Higher tertile indicates increased social vulnerability.