A naturally occurring cutaneous fibroma of deer has proven to be experimentally transmissible in deer. The causative agent is a virus that is readily alterable through Berkefeld N candles and that survives in fibroma tissue for at least as long as 27 months in glycerol-saline at –20°C. The experimentally produced deer fibroma has an incubation period of about 7 weeks, a very slow rate of growth, and a high regression rate.

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