COVID-19 vaccine trial participants reveal why taking part was so important to them Before COVID-19 vaccines were approved for distribution around the country, Americans braved possible side effects by volunteering for vaccine trials to help others. Share Updated: 10:58 AM CST Feb 19, 2021 Troy Frisby COVID-19 vaccine trial participants reveal why taking part was so important to them Before COVID-19 vaccines were approved for distribution around the country, Americans braved possible side effects by volunteering for vaccine trials to help others. Share Updated: ...