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

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What the CDC's 'substantial' and 'high' levels of Covid-19 transmission actually mean
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Health guidance issued Tuesday recommends fully vaccinated people wear masks indoors if they're in areas with 'substantial' or 'high' transmission of Covid-19. The CDC has a 4-tiered system that measures the level of community transmission in each county.

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.

'I'm confused': Dr. Wen discusses mixed messaging around mask policy 01:45Several medical experts took issue with parts of the CDC's decision to update the mask guidance and its specific metrics.For one, the CDC's system solely is based on new cases and positivity rate -- but not vaccinations, hospitalizations, deaths or any of the other relevant metrics experts have come to know since the pandemic began.

The US is not doing a lot of testing, he said, and much of the testing done is at home and not being reported to local authorities. And many people who are getting infected now or experiencing mild symptoms are not seeking out tests."Generally speaking, the people who are presenting for testing are either people who are getting very sick, or people who are developing telltale symptoms of Covid like loss of taste or smell," he said.

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