(CBS Detroit/AP) — More than a quarter of NHL teams have been shut down through at least the weekend after the Columbus Blue Jackets, Montreal Canadiens, Edmonton Oilers and Ottawa Senators paused all activities Monday because of several positive COVID-19 test results among players.

The Blue Jackets had games set for Monday night at Buffalo and Thursday at home against the Sabres rescheduled, and the NHL postponed the New Jersey Devils’ game at the Pittsburgh Penguins set for Tuesday, bringing the total to 43 across the league this season. The league said Columbus was shut down because of “concern with the number of positive cases within the last several days as well concern for continued COVID spread.”

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A total of 10 teams have closed practice facilities through the Christmas break, with the Blue Jackets, Canadiens, Oilers and Senators making the move Monday. The Boston Bruins, Colorado Avalanche, Detroit Red Wings, Florida Panthers, Nashville Predators and Toronto Maple Leafs are also on that last, and the Calgary Flames just reopened to players, coaches and staff not in protocol.

“The Red Wings have followed, and will continue to follow, all recommended guidelines aimed at protecting the health and safety of their players, staff and community at large as set by the NHL, local, state and federal agencies,” the team said in a press release.

Because of the many postponements, including everything scheduled for Wednesday, the NHL has just nine games left on the schedule through Thursday.

The Blue Jackets canceled their morning skate Monday while awaiting COVID-19 test results, a day after calling off practice because of virus concerns. They could resume practice Sunday if cleared by the league and they are scheduled to face Toronto next Monday, though games involving teams on opposite sides of the U.S.-Canada border could continued to be postponed into next week.

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The league and NHL Players’ Association said Sunday the plan was to avoid a full league shutdown, pausing team activities on a case-by-case basis and postponing all cross-border games through Thursday. The Christmas break begins Friday and runs through Sunday, with games scheduled to resume next Monday.

“We will continue to play the 2021-22 regular season schedule,” the NHL and NHLPA said Sunday in a joint statement. “Although there has been a recent increase in positive COVID test results among players, coaches and hockey staff, there have been a low number of positive cases that have resulted in concerning symptoms or serious illness.”

More than 15% of the league’s players are in virus protocol. The spread of delta and omicron variants across North America has made Olympic participation increasingly unlikely, with a final decision expected this week.

The U.S. and Canadian women’s hockey teams were set to play a pre-Olympic game Monday night in St. Paul, Minnesota, but that was canceled because of COVID-19 concerns.

Much about the omicron coronavirus variant remains unknown, including whether it causes more or less severe illness. Scientists say omicron spreads even easier than other coronavirus strains, including delta, and it is expected to become dominant in the U.S. by early next year. Early studies suggest the vaccinated will need a booster shot for the best chance at preventing an omicron infection but even without the extra dose, vaccination still should offer strong protection against severe illness and death.

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