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COVID-19: новости, меры и просто поговорить
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в ответ Van Doren 11.10.20 13:06
https://www.cdc.gov/mmwr/volumes/70/wr/mm7021e1.htm
COVID-19 incidence was 37% lower in schools that required teachers and staff members 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).