San Francisco 49ers not allowed to play in stadium for 3 weeks under new COVID-19 restrictions - ABC News
2021 Buffalo Bills schedule: Complete match-up information for 2021 NFL season
Study: NFL games in 2020 led to COVID spikes in communities - Los Angeles Times
Three NFL games moved due to COVID-19 outbreaks - CBS News
Three NFL games postponed due to COVID-19 outbreaks - Sports Illustrated
NFL reexamining COVID-19 protocols after sudden wave of positive cases late in 2021 season
Browns quarterback Baker Mayfield, coach Kevin Stefanski test positive for Covid, Cleveland Browns
NFL COVID-19 outbreak - Can the league really get through the 2020 season? What we know about new positive coronavirus tests - ESPN
Getting to January a major challenge for NFL as Covid-19 ravages team rosters
AP sources: 3 NFL games moved due to COVID-19 outbreaks - KESQ
Canceled football games a sign of local COVID comeback
Ravens Game Against Steelers Is Moved Again, to Tuesday Night - The New York Times
NFL Health and Safety Fact Sheet