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Study population
The study population included individuals aged 5–10 years or 12–15 years, who had no documented positive PCR for SARS-CoV-2 infection or a positive state-regulated antigen result before the study period, had not stayed abroad during the whole study period, had not been vaccinated before their age-group eligibility time, and had not been vaccinated with a vaccine other than BNT162b2 before the beginning of the study period.
