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Spread of the Delta variant may make it even harder to reach herd immunity, expert says
CNN
With so many areas in the United States with low vaccination rates, the spread of the Delta variant of the coronavirus will make it that much harder for the country to reach herd immunity, a top expert says.
"We don't exactly know what the herd immunity percentage would be for Covid-19. It would be different for the Delta variant, and higher, because it is more transmissible," Dr. Rachel Levine told CNN's Ana Cabrera on Friday.More Related News