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. 2024 Aug 28;12(10):e00691-24. doi: 10.1128/spectrum.00691-24

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Graph depicts seroprevalence change for two groups over time. In September 2021, Group 1 (“no mask” districts) had 47% seroprevalence and Group 2 (“full mask” districts) had 35%. By December 2021, Group 1 increased to 62%, and Group 2 increased to 47%. — SARS-CoV-2 infection-induced seroprevalence among specimens from individuals aged 5–17 years collected in ZCTAs with a full school mask policy and in ZCTAs with no school mask policy during September 1–30, 2021 and December 15, 2021 to January 14, 2022. Note: These descriptive statistics of seroprevalence is estimated with survey weights adjusting for age, sex, and metro status. Lines represent 95% confidence interval (CI).