Colorado residents have been spotting cottontail rabbits with unusual “wart-like” growths on their faces, but don’t worry – the infection is mostly benign. According to Colorado Parks and Wildlife spokesperson Kara Van Hoose, the papillomavirus infection can be spread by ticks, fleas, or other biting insects.
Van Hoose has received over a dozen reports of the infected rabbits, with some growths taking on a horn-like appearance. The virus doesn’t harm the rabbits immediately, but it may impact their ability to eat or drink. Most cottontail rabbits survive the infection without any long-term effects.
The papillomavirus is not contagious to humans or pets and cannot spread through contact. However, there are human strains of the virus, which Van Hoose warned against. She also advised pet owners to keep their animals away from infected rabbits.
As Colorado’s tick season reaches its peak, the state sees an increase in tick-related emergencies, with some areas experiencing higher rates than others. While the specific type of tick that carries Lyme disease is not found in Colorado, other tick-borne diseases are present.
Residents can reduce their risk by being mindful of tick-borne illnesses during the active tick season (April to October). If you find a tick attached to your body, remove it promptly with tweezers and dispose of it.
Source: https://www.axios.com/2025/08/13/colorado-rabbits-horns-tentacles-virus-ticks