Multiple counties in Utah and Arizona have some of the lowest vaccination percentages in the nation.
This map of per-county kindergartner vaccination percentages in Utah and Arizona shows that all but two counties have percentages below the 95% level needed for herd immunity, with nine counties having percentages lower than 85%. The two counties focused on in the story: Washington County, Utah, and Mohave County, Ariz., have 79% and 78% vaccinated, respectively.