Posted in NEWS As US nears vaccine tipping point, dramatic decrease in COVID-19 cases could come without herd immunity, some experts say May 4, 2021 Some researchers say just 10% to 15% more Americans need to be vaccinated against COVID-19 to reach a tipping point at which cases dramatically fall. http://rssfeeds.usatoday.com/~/650785236/0/usatoday-newstopstories~As-US-nears-vaccine-tipping-point-dramatic-decrease-in-COVID-cases-could-come-without-herd-immunity-some-experts-say/