NPR

The CDC Said The Delta Variant Is As Contagious As Chickenpox. That's Not Accurate

A leaked document compared it to the highly contagious children's disease. Data does not support this claim. Nonetheless, the delta variant is one of the world's most contagious respiratory diseases.
The number of people that one sick person will infect (on average) is called R0. Here are the maximum R0 values for a few viruses.

In a leaked report, the Centers for Disease Control and Prevention made a surprising claim about the delta variant of the coronavirus: It "is as transmissible as: - Chicken Pox," the agency wrote in a slideshow presentation leaked to The Washington Post on July 26.

Chickenpox is one of the most contagious viruses known. Each individual can spread the virus to as many as "90% of the people close to that person," the CDC reports.

Is the delta variant that contagious as well?

The short answer is at the University of Leuven in Belgium.

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