With just days to go before the Super Bowl, the Centers for Disease Control and Prevention (CDC) is cheerleading the National Football League (NFL) for its COVID-19 mitigation strategy,
The CDC has published a paper jointly authored by CDC and NFL and the NFL Players Association medical experts and epidemiologists. The publication shares the benefits of the NFL’s COVID-19 mitigation strategy, with elements that the CDC says can be broadly applicable throughout society to limit the spread of the virus, including “to settings such as long-term care facilities, schools, and high-density environments.”
The sports league’s strategy has contributed important data and influenced CDC’s thinking.
The NFL, through its season-long, robust testing and contact tracing programs, found that transmission of the virus occurred in less than 15 minutes of cumulative interaction between individuals, the timeframe initially used in the CDC’s definition of “close contact.” Evidence generated by the NFL data led to a revised definition of high-risk contacts that caused contact tracers and medical experts to consider information beyond duration and distance, such as masking and ventilation.
The NFL data also led to a mid-season launch of the NFL’s “Intensive Protocol,” a stricter set of virus prevention measures imposed at an NFL club in response to a positive case and eventually adopted by all clubs. The NFL consists of 32 member clubs based in 24 states.
The new high-risk contact definition, used in the NFL and derived from the NFL’s findings, includes “assessment of face mask use (e.g., medical mask versus cloth face covering, proper mask use for both infected person and contact, and any mask removal to eat or drink) and setting and ventilation (e.g., outdoor, indoor large volume, indoor small volume and during transportation).”
The CDC says these criteria were used to effectively identify and quarantine any person who had been exposed to an infected individual in an effort to mitigate the spread of the virus.
Together with continuous evidence review throughout the season, the new definition of high-risk contact and implementation of the NFL’s Intensive Protocol decreased high-risk contacts, continuously improved mitigation measures, and prevented spread of the virus within the NFL environment, according to the joint paper.
The lessons from the NFL season are applicable to non-sports settings, such as essential workplaces, long-term care facilities, and schools, the publication said.
“Partnering with the CDC to share findings from our season with the public health community is important to society as other workplaces, institutions and organizations look for effective strategies to reduce the risk of the virus,” said Dr. Allen Sills, the NFL’s chief medical officer and a co-author of the paper
The publication cites 20 individuals from October 15 – November 21 who were identified as high-risk contacts and later became positive cases. To date, that figure has increased from 20 to 37 individuals. The high-risk contact definition and accompanying protocols enabled identification and proactive quarantine of those 37 individuals in the early days of their infections.
The Intensive Protocol, which has evolved throughout the NFL season based on ongoing testing and contact tracing data, is deemed in the publication “an effective mitigation measure.” No high-risk contacts were identified in 71% of cases where the infected individual’s club was under those stricter measures. Further, the protocol decreased close contacts by 60% from October 1 – November 21, when 29 of 32 clubs spent 431 days under the Intensive Protocol.
The NFL’s Intensive Protocol includes virtual-only meetings; limited outdoor gatherings; increased physical distancing; mask wearing at all times, including for players during practice; and eliminating group meals.
The league began implementing the Intensive Protocol on October 1, 2020, for any club with a COVID-19 positive case and the recent opposing team if exposed during a game. Beginning November 21, 2020, a league-wide adoption of the Intensive Protocol was mandated though the end of the season in recognition of its benefits in preventing COVID-19 spread.
“In the NFL, COVID-19 transmission was identified in persons with less than 15 minutes of consecutive or cumulative interaction and was reduced through implementation of an intensive protocol focused on environmental change, increased personal protection, avoidance of high-risk interactions such as vehicle sharing, eating in the same room or common areas, and expansion of the components of contact tracing to incorporate high-risk contact designations,” the publication concludes.
CDC notes that the protocols implemented by the NFL were “resource-intensive,” certain strategies such as accounting for the specific characteristics of the close contact, in addition to time and duration, and creation of an intensive protocol are “applicable to other settings, including essential workplaces, long-term care facilities, and schools.”
The research paper, which is available to the public, is titled “Implementation and Evolution of Mitigation Measures, Testing, and Contact Tracing in the National Football League, August 9–November 21, 2020.”
Sources: CDC, NFL and NFLPA
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