The WHO and CDC state that it is primarily spread during close contact and by respiratory droplets produced when people cough or sneeze ; Busting coronavirus social distancing myths , Harvard T.H . Chan School of Public Health , summary of 16 March 2020 Op-Ed piece in `` USA Today '' by HSPH ’ s Marc Lipsitch and Joseph Allen .
Marc Lipsitch and Joseph Allen wrote an Op-Ed piece in `` USA Today '' related to the coronavirus pandemic .