Those Norwegian safety measures are useless: Lots of people are totally asymptomatic, meaning no fever, they never feel sick, etc. But they still spread the virus.

The viral infection actually has few if any symptoms. After your viral peak, when the innate immune system starts deactivating virus, you might get autoimmune symptoms. This basic misunderstanding of how the virus works has caused all sorts of idiotic decisions.

People are very infectious before any symptoms appear. Then for a few days more. After that they may have more and more severe symptoms but they probably are not shedding enough intact virus to be contagious.