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Why the Delta variant is spreading so much faster than other coronavirus strains

Why the Delta variant is spreading so much faster than other coronavirus strains
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Worldwide, there is an alarming surge in coronavirus cases -- and health experts say a key factor in this latest wave is the highly contagious Delta variant.

The variant is spreading about 55% faster than the alpha strain that was first identified in the United Kingdom late last year, according to the World Health Organization (WHO) -- and that strain spreads about 50% faster than the version that first began infecting people in late 2019.

"We should think about the Delta variant as the 2020 version of COVID-19 on steroids," Andy Slavitt, a former senior adviser to President Joe Biden s Covid Response Team, told CNN last week .
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