A new and dangerous virus has been discovered in wild cats in the United States. Scientists and wildlife officials in Colorado have reported the first case of rustrela virus in a mountain lion, causing a fatal neurological disease known as staggering disease.
In May 2023, Colorado Parks and Wildlife officials were alerted to a sick mountain lion in Douglas County, Colorado. The animal was found with paralyzed hind legs, forcing it to drag itself with its front legs. The mountain lion was tranquilized and euthanized to preserve its brain for further study. A video of the sick mountain lion was captured by a homeowner in the area.
Initial tests did not detect common germs that cause brain infections in cats, but a genetic analysis later revealed the presence of rustrela virus in the cat’s brain and spinal tissue. Rustrela was first discovered in animals in a German zoo in 2020 and has been linked to staggering disease in felines in Europe.
The virus found in the Colorado mountain lion is genetically different from the European variants, raising concerns about its potential spread in the U.S. Rustrela has a wide range of hosts and its impact on other animals is still unknown. While similar to the rubella virus in humans, which can cause neurological issues, it is unclear if rustrela can infect people.
Researchers emphasize the need for further investigation and monitoring of sick animals in the region. Residents are encouraged to report any sightings of sick mountain lions to local wildlife officers to aid in ongoing research efforts.
The discovery of rustrela virus in the U.S. highlights the importance of collaboration with European colleagues to better understand the virus and its potential impact on wildlife. By identifying cases of staggering disease, scientists can gather more information and work towards finding ways to prevent its spread.
