There's no proof that it exists at all, no single source has actually compiled enough hard evidence to show ANYTHING worthwhile so everything anyone says about the subject is going to be conjecture based on antecdotal evidence.
To the poster Mike177, highly contagious? How do you figure? If it were so contagious, why would it be restricted to, in your mind, a certain color morph of animal? Or more likely to occur in a given strain than another? That's not just conjecture, but it's poor conjecture based on avaliable evidence.
Dr. Antfarm, my thoughts are closer to yours. The antecdotal evidence I have heard leads me to believe that burms as a species are simply more prone to respiratory tract infections and that whatever blind spot their immune system may have tends to leave animals who get sick once to be more likely to do so again in the future. If it's a genetic trait related to the immune system, the constant reinforcement of genes involved with line breeding for a color morph *might* leave certain types more likely of exhibiting the condition but I haven't seen any proof that this is the case and if it's exhibited specieswide than the reinforcement of genes happens with every breeding regardless of color related genotypes.
I think if more owners stopped for a few minutes and considered the climate burms encounter in the wild and stopped keeping them on aspen shavings with a 20% relative humidity in the enclosure it might amazingly clear up the problem (which, as I said, may or may not exist anyway and until someone wants to keep four or five thousand animals to gather information prior to setting up controls with an even larger group, no "I had two burms and they both got sick" stories are going to convince me otherwise).
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-Seamus Haley
"Genes, Like Leibnitz's monads, have no windows; the higher properties of life are emergent... And once assembled, organisms have no windows." - Edward Wilson, Sociobiology
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