Substantial transmission means at least 50 new cases per 100,000 people in the last seven days, while high transmission is more than 100 cases per 100,000 people over the last week.
FILE PHOTO: A general view of Centers for Disease Control and Prevention headquarters in AtlantaWASHINGTON - The Centers for Disease Control and Prevention said on Wednesday that 66.6% of U.S. counties had transmission rates of COVID-19 high enough to warrant indoor masking and should immediately resume the policy.
In a toughening of guidance issued earlier this month, the CDC also recommended all students, teachers and staff at schools for kindergarten through 12th grade wear masks regardless of whether they were vaccinated.
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