Bridgette Melo, 5, holds the hand of her father, Jim Melo, during her inoculation of one of two reduced 10 ug doses of the Pfizer BioNtech COVID-19 vaccine during a trial at Duke University in Durham, North Carolina September 28, 2021 in a still image from video. Video taken September 28, 2021. Shawn Rocco/Duke University/Handout via REUTERS