Denmark discovered that a mutant virus may cause the vaccine to become invalid, and tens of millions of mink farms have been culled. Due to the discovery of a mutant new crown virus that can be transmitted to humans in the mink farm, the Nordic country Denmark decided to culminate as many as 17 million minks.
The Danish Prime Minister Mette Frederiksen announced the news at a press conference on November 4, 2020. She said that this decision was based on the "risk" of the mutated virus to the effectiveness of future new coronary pneumonia vaccines.
Denmark is the world's largest mink producer. The police said that mass culling should be carried out as soon as possible. For several months, COVID-19 outbreaks have occurred in mink farms in the Jutland region of northern Denmark and other parts of Europe.