Coronavirus cases have been detected in mink farms in Denmark's northern Jutland region, and in other parts of Europe, for several months.
But cases are spreading fast in Denmark, and five cases of the new virus strain were found on mink farms. Twelve people had become infected, the authorities said.
Prime Minister Frederiksen described the situation as "very, very serious".
She cited a government report which said
the mutated virus had been found to weaken the body's ability to form antibodies, potentially making the current vaccines under development for Covid-19 ineffective.
"We have a great responsibility towards our own population, but with the mutation that has now been found, we have an even greater responsibility for the rest of the world as well," she told a news conference.
https://www.bbc.co.uk/news/world-europe-54818615
Presumably this mutation would also make the disease more deadly in those who caught this version