The United States may not get to herd immunity if many Americans refuse to get a coronavirus vaccine that's around 70 percent effective, according to Dr. Anthony Fauci.
Fauci, director of the National Institute of Allergy and Infectious Diseases, in an interview with CNN spoke about how effective a COVID-19 vaccine might be, noting that this remains unclear but that he'd "settle" for one being about 70 or 75 percent effective since "that would bring you to that level of what would be herd immunity level." Herd immunity, as the Mayo Clinic explains, "occurs when a large portion of a community (the herd) becomes immune to a disease, making the spread of disease from person to person unlikely."
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