The NHL has already endured one mumps outbreak in recent years, so the Vancouver Canucks' announcement that they are dealing with the virus is going to be a topic of worried conversation around the league.
The Canucks reported Friday that one player, defenseman Troy Stecher, has been diagnosed with the contagious virus, and several others have presented symptoms.
The team said in a release that they are working closely with not only health organisations but the NHL and NHLPA to help minimise spread of the viral infection.
"We're taking this very seriously given how easily mumps can spread," Canucks general manager Jim Benning said.
"At this point Troy Stecher is the only player with a confirmed test result. Chris Tanev, Nikita Tryamkin, Mike Chaput and Markus Granlund have each presented symptoms. We'll continue to follow all protocols in accordance with Vancouver Coastal Health guidelines in order to prevent further infection."
Mumps causes swollen and tender glands as well as flu-like symptoms, and it can take up to two weeks between the time of infection and the onset of symptoms.
A mumps outbreak in 2014 affected more than a dozen NHL players - including Pittsburgh Penguins star Sidney Crosby - on five teams, as well as two referees.
Health officials will be at Rogers Arena on Friday to screen players and staff and immunise those who need a shot.