A total of 98.2% of the US population — around 325 million people — live in counties considered to have “high” or “substantial” Covid-19 transmission, according to CNN’s analysis of data published Monday by the US Centers for Disease Control and Prevention.
Three quarters of the population, or 250 million people, live in “high” transmission areas alone.
That means the latest CDC guidance, which advises even fully vaccinated people to mask up indoors in areas with substantial or high transmission, would apply to all but six million Americans.
Only 0.2% of the population — fewer than 600,000 people — live in areas with “low” transmission. Another 1.6% are in areas with “moderate” transmission
The CDC considers a county to have “high” transmission if there have been 100 or more cases of Covid-19 per 100,000 residents in the past week, or a test positivity rate of 10% or higher during the same time frame. For “low” transmission, those numbers must be fewer than 10 new cases per 100,000 or a test positivity rate under 5%.