Since the Covid-19 pandemic began, public health experts have looked to vaccines with the goal of creating “herd immunity,” where so many people are vaccinated that the virus stalls out. Now it is clear we will not reach that goal, meaning the threat of the pandemic may drag on for years. One of the nation’s leading infectious disease experts discusses how we are missing the target and what it means.


  • Dr. William Schaffner, Professor of Preventive Medicine and Infectious Diseases, Vanderbilt University Medical School

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