What the COVID-19 vaccine owes to Dr. Jonas Salk and the end of 'polio season' - USA TODAY

As the coronavirus vaccine goes into the arms of Americans, it's worth pausing to consider the trailblazing polio vaccine trial that made it possible. https://www.usatoday.com/story/news/health/2020/12/25/covid-19-vaccine-owes-much-jonas-salks-polio-vaccine-trial/3989733001/