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Is herd immunity for Covid-19 still possible?
CNN
This time last year, the brand new, stunningly effective Covid-19 vaccines were rolling out across the country, injecting a strong note of optimism into the United States' once fumbling pandemic response.
Millions of people were lining up daily to get their shots. Instead of the steady drumbeat of cases, hospitalizations and deaths, we were tracking a new number: the percentage of Americans who had been vaccinated. This number, we believed, was our best chance to beat the virus.
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