Delta variant now the dominant strain of coronavirus in US, CDC says

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ATLANTA – The Centers for Disease Control and Prevention estimates that the delta variant is now the dominant strain of coronavirus in the U.S.

The variant was first identified in India in December of 2020. It was detected in the U.S. in March, WJW reported.

The CDC reports the delta variant now accounts for more than 51% of coronavirus cases in America.


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In some states where the vaccination rates are lower, the delta strain accounts for more than 80% of new infections. These states include Kansas, Missouri and Iowa, the CDC reports.

According to the World Health Organization, this strain is considered to be “the fastest and the fittest.”

Specialist Dr. Wilson told Yale Medicine that the delta variant is 50% more contagious.


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“In a completely unmitigated environment — where no one is vaccinated or wearing masks — it’s estimated that the average person infected with the original coronavirus strain will infect 2.5 other people,” Dr. Wilson said. “In the same environment, Delta would spread from one person to maybe 3.5 or 4 other people.”

Health experts say the good news is that the vaccines being used in the U.S. are highly effective against the virus.

“We have two Americas: the vaccinated and the unvaccinated,” infectious disease specialist Dr. Paul Offit told NPR.

“We’re feeling pretty good right now because it’s the summer. But come winter, if we still have a significant percentage of the population that is unvaccinated, we’re going to see this virus surge again,” Offit said.


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