Dear X, I will try to clear some of your confusion. Fromm-D was actually a chicken embryo cell culture vaccine. (This is very similar to the Fervac-D vaccine.) The newer version Galaxy-D is a simian (monkey) cell culture vaccine. No virus involved in either of these 2 vaccines. The new Merial Purevax-D is a recombinant vaccine using a canary pox virus as a carrier. They also use this canary pox vector in their dog vaccines. No vaccine connection to lymphoma, but there may be a ferret retro virus involved in lymphoma. Hope that helps, Jerry Murray, DVM Message URL: http://groups.yahoo.com/group/Ferret-Health-list/message/12862 [Posted in FML issue 3772]