NFL COVID-19 protocol changes, Week 15 postponed games, new testing and return-to-play rules - Can the NFL navigate the omicron variant? - ESPN
UpNorthLive - The Florida Department of Health says you
NFL will end mandatory COVID-19 testing for asymptomatic vaccinated players in major protocol change
NFL Testing Protocols Aim to Mitigate the Spread of COVID-19
The NFL Needs to Finalize Its COVID-19 Plans—and Soon - The Ringer
NFL chief medical officer: Asymptomatic people are not spreading COVID-19 - The Boston Globe
Evaluation of Test to Stay Strategy on Secondary and Tertiary Transmission of SARS-CoV-2 in K–12 Schools — Lake County, Illinois, August 9–October 29, 2021
More evidence indicates healthy people can spread virus
College football, coronavirus and the question of testing - Sports Illustrated