Bill Washburn, a 76-year-old registered nurse, has participated in both polio and COVID-19 vaccine rollouts, bearing witness to over six decades of vaccine science between the two historic immunizatio…… Source: http://feedproxy.google.com/~r/ann-en/~3/M0BmWsXZbtY/from-polio-to-covid-19-vaccines-bring-hope-way-forward-in-major-disease-outbreaks