The only thing I can say is that people should start considering using GalaxyD. (I have been using it since 1998.) It may not be USDA LISCENCED" for ferrets, but it was tested on them and proven to be effective to guard our ferrets against the CANINE Distemper Virus. Since Fervac D is no longer being produced and Merial is sooooo lax in making sure to have enough Pruvax, it looks like people are going to be down to 2 choices. Either don't vaccinate for Canine Distemper at all, OR start using Galaxy D to guard their ferrets against the canine distemper virus. Debi [Posted in FML issue 5325]