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With the more contagious Delta variant, some US officials are issuing new mask guidance By Holly Yan and Madeline Holcombe, CNN Published Jun 30, 2021 6:10:19 AM enablePagination: false endIndex: (CNN) The more transmissible Delta variant has spread to almost every state in the US, fueling health experts concerns about COVID-19 spikes. The variant is expected to become the dominant coronavirus strain in the US, the director of the Centers for Disease Control and Prevention said. And with half the US still not fully vaccinated, doctors say it could cause a resurgence of Covid-19 in the fall just as children too young to get vaccinated go back to school.

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