Vaccination rates for each county were aggregated in 4 groups of less than 30%, 30% to less than 40%, 40% to 50%, and greater than 50%. Lines indicate temporal changes in new COVID-19 cases per 100 000 people during July 1 to 15, July 16 to 31, August 1 to 15, and August 16 to 31.
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Cuadros et al. (2022) studied this question.