Keller de Martini, 55, a dental surgeon, a volunteer in COVID-19 vaccine trial for AstraZeneca, poses for a photograph in Sao Paulo, Brazil, December 07, 2020. Martini who is married and has two sons, said: "I think when we look to this period, one legacy will be how everyone – the scientists, the health workers, everyone – fought to stop the loss of lives to COVID-19. It will be a very important moment to remember. Children will study this in school to understand the fight and difficulties we lived. And this legacy that will remain for everyone." Picture taken with a slow shutter speed. REUTERS/Amanda Perobelli SEARCH "PEROBELLI VACCINE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES