The Norwegian actor, who played Tormund Giantsbane in HBO's epic fantasy series, took to Instagram on Monday to share his diagnosis.

Though in "good health", Hivju said, he and his family were in self-isolation.

"Greetings from Norway! Sorry to say that I, today, have tested positive for COVID19, Corona virus. My family and I are self-isolating at home for as long as it takes. We are in good health - I only have mild symptoms of a cold," he wrote.

 
 
 
 
 
 
 
 
 
 
 
 
 

Greetings from Norway! Sorry to say that I, today, have tested positive for COVID19, Corona virus. My familiy and I are self-isolating at home for as long as it takes. We are in good health - I only have mild symptoms of a cold. There are people at higher risk for who this virus might be a devastating diagnosis, so I urge all of you to be extremely careful; wash your hands, keep 1,5 meters distance from others, go in quarantine; just do everything you can to stop the virus from spreading. Together we can fight this virus and avert a crisis at our hospitals. Please take care of each other, keep your distance, and stay healthy! Please visit your country's Center for Disease Control's website, and follow the regulations for staying safe and protecting not just yourselves, but our entire community, and especially those at risk like the elderly and people with pre-existing conditions. @grymolvaerhivju #fightcorona #solidarity #takecare #folkehelseinstituttet Thanks to @panoramaagency

A post shared by Kristofer Hivju (@khivju) on Mar 16, 2020 at 1:48pm PDT

The actor appealed to people to be "extremely careful".

"... wash your hands, keep 1,5 meters distance from others, go in quarantine; just do everything you can to stop the virus from spreading. Together we can fight this virus and avert a crisis at our hospitals," he said.

Hivju, 41, also urged fans and followers to follow the regulations for "staying safe and protecting not just yourselves, but our entire community, and especially those at risk like the elderly and people with pre-existing conditions".

He joins actors Idris Elba, Tom Hanks and his wife, actor Rita Wilson and former Bond girl Olga Kurylenko, who tested positive for coronavirus. Universal Music chairman and CEO Lucian Grainge was hospitalised for treatment of the infection over the weekend.

The number of deaths due to the coronavirus pandemic worldwide has passed 7,000, with more than 175,530 cases in 145 countries.