In Fort Collins, in northern Colorado, several wild rabbits have been presenting dark outgrowths on the head and the muzzle since the beginning of August. Their unusual appearance draws attention, sometimes with some discomfort.
These hard masses are the consequence of a viral infection specific to rabbits. It manifests itself by the formation of skin tumors which, by developing, can give the impression of horns or rigid appendages.
The circulation of the virus is favored during the summer, a period when chips and ticks are the most active. These parasites easily transmit the infection from one animal to another, thus accelerating its spread in areas where rabbits are numerous.
The affected individuals represent no risk for humans, nor for other domestic animal species. However, the pathogen circulates easily between rabbits, making domestic populations particularly sensitive.
In the latter, infection can cause more severe, sometimes disabling forms. Tumors located near the eyes or mouth can hinder vision or prevent the animal from feeding properly.
Despite these possible complications, the rabbit immune system is sometimes capable of eliminating the virus and completely disappearing the growths, without human intervention.
While waiting for this natural healing, the authorities advise against manipulating, approaching or nourishing the sick specimens. Such caution reduces direct contact and therefore the risks of contamination between individuals.
