These maps show how Covid came back in a month


The Centers for Disease Control and Prevention (CDC) measures community transmission using two measures – the number of cases per 100,000 people and the test positivity rate, both measured in the previous seven days.

The latest CDC figures show an alarming increase in the number of counties considered to be at high risk of community transmission. As of Monday, 2,361 counties in the United States were listed in the “high” level, a marked increase from 457 counties at the same level in early July. A look at the past five weeks shows how rapidly community transmission has increased across the country.

An area with a low transmission rate has 10 or less cases per 100,000 people and a positivity rate less than 5%, while an area with a high transmission rate has 100 or more cases per 100,000 people and a rate of positivity of 10% or more.

The increase in community transmission has led to renewed mask mandates and urgent pressure for vaccinations across the country, especially in areas with low vaccination rates. The CDC now recommends that people wear masks indoors if they are in areas with “significant” or “high” levels of spread, whether or not they are vaccinated. You can find your county’s transmission level on the CDC website, which is updated several times a week.
Vaccines are the most effective tool to fight the spread of the new Delta variant, according to available data, with studies indicating that all three commonly available vaccines are able to prevent serious illness or death from Covid-19.

Read more:

  • Track cases of Covid-19 in the United States where you live
  • How many people are vaccinated in your state

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