The Medical University of Gdansk said that eight animals were found to be infected at a breeding farm in the Pomeranian Voivodeship. 

Poland, a major producer of mink fur, started coronavirus tests among its farmed mink and workers this month after a mutation of the virus was found in Denmark. 

Veterinary and sanitary authorities in Poland said last week that 18 coronavirus cases had been identifies among mink farmworkers since the start of the pandemic, but it was unlikely that to have been spread by the animals.

"The obtained results indicate the possibility of transmission of the virus from humans to minks," the Medical University of Gdansk said in a statement. 

Poland is the world's third-largest fur producer after China and Denmark, according to animal rights groups that are campaigning for an end to breeding animals like mink for fur.