Okay, first off, the type of lymphoma which clumps is NOT one of the more common types of lymphoma. That form might well be caused by a viral exposure BUT from what the MIT Dept of Comparative Med study indicated that exposure would have usually happened two and a half YEARS to three and a half YEARS before the lymphoma shows up, so there is not anything useful you can do in terms of separation. In Dr. Bruce William's website you can find a useful article on this topic. You can reach there from the Ferret Health List on Yahoogroups or from MiamiFerret. [Posted in FML 7132]