I am not sure what they are so concerned about. Hardly anyone today wears mink coats, but maybe they think it will be transmitted from a shtreimel into the person wearing it. Will it jump from shtreimel to shtreimel? Will shtreimels have to go into quarantine - they are generally in quarantine all week long anyway and only taken out on Shabbos, so a two week quarantine would make a person skip one Shabbos of the shtreimel, though maybe some people have two shtreimels and could alternate... oy, the minks!