According to this (paywall) article:

"A “very very serious” mutated version of coronavirus has been found in mink farms in northern Denmark. Scientists have warned that the new mutation could spark a new global pandemic and render current vaccine developments obsolete.

So far, 11 people in northern Jutland and one in Midtsjælland have been detected with the mutated strain of COVID-19 that appears to have been transmitted from mink to humans.

Danish prime minister Mette Fredicksen cited a government report which said the mutated virus weakened the human body’s ability to form antibodies, potentially making the current vaccines under development for COVID-19 ineffective."

This is why vaccines will never be a silver bullet. What it does do is provide the drug industry with a self-perpetuating goldmine.

'Oh, that vaccine we just gave you is obsolete - now you need to take this one!'