Sandro Galea, a physician, epidemiologist and dean at Boston University's School of Public Health, said the diagnosis should be a wake-up call to a president who appears to have ignored basic public health precautions. Trump has often appeared without a mask at many public functions, including the recent announcement of federal appeals court judge Amy Coney Barrett as his nominee for the Supreme Court. The Rose Garden event drew about 150 guests to the White House, most of whom declined to wear masks or social distance.Trump has “a lot of interpersonal contact, shaking hands and things, which is presumably not being accompanied by suitable hand washing, disinfection,” Galea said, "all the very fundamental public health steps we know should be taken.”