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What the CDC's 'substantial' and 'high' levels of Covid-19 transmission actually mean


AP
By Eric Levenson and Jessica Firger, CNN
Health guidance issued Tuesday recommends that fully vaccinated people wear masks indoors if they’re in areas with “substantial” or “high” transmission of Covid-19. But what do “substantial” and “high” actually mean?
The two terms are part of the US Centers for Disease Control and Prevention’s four-tiered system that measures the level of community transmission in each county: low, moderate, substantial and high. On the CDC’s website, you can run a search by state or county and click around the color-coded map to see how active the virus is where you live. ....

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