410K views · 604 reactions | Infectious diseases professor Dr. William Schaffner says wearing masks needs to be a "social norm." “The time to normalize wearing masks and social distancing behavior is now,” he says. As coronavirus cases hit record highs in the three most-populated states, Schaffner is "very concerned that the second wave this fall will be substantially greater than what we had experienced so far.” https://cnn.it/2CA8Gdm | CNN Replay | Facebook