Indoor sports like ice hockey are high-risk activities for the spread of COVID-19, according to the US Centers for Disease Control and Prevention.
The conclusions about such sports were contained in a section of the CDC's Morbidity and Mortality Weekly Report posted online Thursday.
The researchers said that each team consisted of players between the ages of 19 and 53, six on the ice and five on the bench at any given time during the game.
"Within five days of completion of the game, 15 individuals experienced signs and symptoms compatible with the 2019 corona virus disease; 13 out of 15 patients had a positive laboratory test result, indicating the SARS-CoV-2 virus causing COVID-19".
Ice hockey involves intense physical exertion, along with heavy breathing during matches and frequent contact between players, the researchers noted in the report.
The players flouted cloth face masks in the locker room and during the game but wore hockey-related protective face gear like plastic half-shields and metal cages, while still others wore no protective face gear, the health agency wrote.
More than one player may have been infected during the game, the researchers acknowledged, but they believe the index was the only source of transmission when the patient was asymptomatic. Increasing the risk of exposure and spreading to other facilities and organizations.
An ice-rink, researchers asserted, poses particular pitfalls in the COVID era.
"The ice rink provides a venue that is likely well suited to COVID-19 transmission as an indoor environment where deep breathing occurs, and persons are in close proximity to one another", the report said.
More infections cropped up on the index patient's team, which the CDC said may have been from more exposure in their separate locker room and sitting closely together on the bench.
Some public health experts called a Rose garden party At the White House in late September, a super-spread event occurred after dozens of attendees of the event contracted the Coronavirus, including President Donald Trump and members of his administration, although it is unclear exactly where the president was first infected.
The study concluded that "internal space and close contact between players during a hockey game increase the risk of infection for players and create the possibility of a highly prevalent event, especially with the ongoing transmission of COVID-19 from society".
Hockey's also had problems in New England during the pandemic.
Although 62% of players experience Govt-19 symptoms, there are no ice referees, or no spectators on the stand.
Dr. Benjamin Chan, a state epidemiologist, said Thursday that in New Hampfer, 158 people associated with 23 different ice hockey teams or organizations have been diagnosed with Covid-19 over the past two months.
The teenager, who was born in 2006, competed with a NY team in an elite tournament in CT from July 31 to August 2, according to Chet Murch, general manager of The Rinks at Exeter in New Hampshire.
Material from prior Globe stories was used in this report.