Nation Johnson & Johnson trials begin vaccinating teens; CDC says fully vaccinated Americans can resume travel: Live COVID-19 updates April 2, 2021 Elinor Aspegren and Adrianna Rodriguez, USA TODAY Comments Off on Johnson & Johnson trials begin vaccinating teens; CDC says fully vaccinated Americans can resume travel: Live COVID-19 updates Moderna can put 50 percent more vaccine dosage in each vial, according to the Food and Drug Administration. Here are the latest COVID-19 updates.