Luxembourg Prime Minister Xavier Bettel is self-isolating for 10 days after testing positive for Covid shortly after a European Union summit, his office has said.

But none of the other 26 EU leaders who attended the Brussels summit Thursday and Friday is considered a contact case, a statement said.

Under the rules in Luxembourg for containing the spread of the virus, close contact with a Covid sufferer is defined as spending more than 15 minutes with them at a distance of less than two metres (six feet) without a mask, according to AFP.

A spokeswoman for Bettel said he had respected the rules during the summit.