NFL Chief Medical Officer Allen Sills said Thursday that the league's new COVID-19 protocols are the result of data that shows the virus is not spreading from asymptomatic players and individuals.
Sills said, per ESPN's Kevin Seifert:
"We've really not seen this phenomenon that people have discussed, which is asymptomatic people in the facility spreading virus to others. As we've gone back and looked throughout the entire season, what we've seen consistently is that when people have symptoms, that's when they seem to be contagious to others. And that's why we're asking people to come forward and acknowledge symptoms because that's the point at which they're vulnerable and the point at which they expose themselves to others.