MLB players must wear Kinexon contract tracing devices at the

MLB announces health and safety protocols for 2021 season, by Rowan Kavner

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MLB players must wear Kinexon contract tracing devices at the start of spring training — or face discipline. And they are encouraged to get the COVID-19 vaccine. – The Morning Call

College football: Inside battle over contact tracing in NCAA - Sports Illustrated

Phillies put three players, two more coaches in MLB's COVID protocols

Boston Red Sox pitcher Matt Barnes tests positive for COVID-19, multiple other players in contact tracing protocols

MLB and NBA Offer Players an Incentive to Get Vaccinated: Normalcy - WSJ

Health and safety protocols for 2021 MLB season

MLB issues coronavirus 2021 health and safety protocols