Coronavirus: Fauci tells Zuckerberg 30,000 people in vaccine trial starting this summer

Anthony Fauci, the federal government's top infectious disease official, says a vaccine trial will start this summer with 30,000 people participating. He also told Facebook chief Mark Zuckerberg that researchers have found no 'deleterious' effects on a person's breathing amid a nationwide battle over whether people should cover their faces to prevent spread through tiny droplets of saliva and mucus.