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Dallas County Reaches Herd Immunity Against COVID-19 – NBC 5 Dallas-Fort Worth July 8, 2021July 8, 2021
US coronavirus: Spread of the Delta variant may make it even harder to reach herd immunity, expert says July 3, 2021
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Experts say ‘herd immunity’ could conquer COVID-19. But is it even possible? April 1, 2021April 1, 2021
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