The NBA and its players have agreed to enhanced health and safety protocols through the holiday season in response to rising virus numbers, with additional testing coming and a return to mask usage in many situations.

The upgraded mask rules will be in place “until agreed otherwise by the NBA and Players Association,” according to a memo shared with teams Thursday night and obtained by The Associated Press. Masks need to be worn again in almost all circumstances during team activities — including travel, when on the bench during games, in meetings and locker room, weight room and training room settings.

The exceptions: during on-court basketball activities for players, and for head coaches during games.

Testing will be increased from Dec. 26 through Jan. 8, the league said. The league also told teams that more requirements and recommendations would be coming in the next few days, “to help reduce the risk of COVID-19 spread within the team environment.”

As of Thursday evening, there were at least 39 players — roughly 8% of the league’s total player roster — from at least 13 different teams known to be in the league’s protocols. Chicago had a league-high eight players known to be in protocols, one more than Brooklyn. James Harden and Giannis Antetokounmpo both entered the protocols earlier this week.