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'Mitigating measures' key to opening schools without vaccinating teachers: CDC director

04:37

CDC director Rochelle Walensky explains to Rachel Maddow that the science shows not a lot of coronavirus transmission when proper mitigation measures, including masking, distancing, dedensification of the classroom, ventilation, contact tracing, hand washing, etc., are in place in schools, so reopening schools without vaccinating teachers is possible when those conditions are met.

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