The Toll of Reaching Herd Immunity Without a COVID-19 Vaccine

Share on PinterestExperts say it would take a long time to reach herd immunity against COVID-19 without a vaccine. AJ Watt/Getty Images Experts say it is unlikely the United States can achieve herd immunity against COVID-19 without a vaccine. They note that viruses such as smallpox and measles weren’t contained until vaccines were developed. They […]