COVID-19 incidence was 37% lower in schools that required teachers and staff to use masks and 39% lower in schools that improved ventilation. Ventilation strategies associated with lower school incidence included dilution methods alone (35% lower incidence) or in combination with filtration methods (48% lower incidence).
COVID-19 incidence was 37% lower in schools that required teachers and staff to use masks and 39% lower in schools that improved ventilation. Ventilation strategies associated with lower school incidence included dilution methods alone (35% lower incidence) or in combination with filtration methods (48% lower incidence).
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萃取時間: 2026-02-05T15:13:54Z 資料來源: CDC MMWR