In reply to gallam1:
I don't know about Denmark, but in the UK the legislation over animal testing puts welfare at a sufficiently high standing that a facility and the PI would probably loose their licences and potentially face criminal sanction for working with animals in conditions resembling animal farming - let alone mink farming.
The animals have unknown medical histories and have probably been jacked full of all sorts of stuff over there lives. I very much doubt there are any medical research facilities or staff equipped or knowledgeable in looking after mink to the required standards. I doubt you'd find a single research facility that would take animals in from a farm - doing so would present an unacceptable risk to the facility and its legal obligations.
I have absolutely no idea how similar a mink immune system is to a human one, and I don't think mink have been well studied as a model organism, so I expect there isn't much expertise to translate findings from them to humans.
A total and immediate cull seems proportionate to me. The Danish government tried, ran in to legal problems and are now dismantling those problems as fast as they can.
https://uk.reuters.com/article/uk-health-coronavirus-denmark-mink/danish-go...
Post edited at 12:16