Myxomatosis is a viral disease in pet and wild rabbits. In the US, this contagious disease is mainly located on the West Coast. Cottontail rabbits are the normal host of the virus and it rarely causes disease in them. This Myxoma virus, a type of pox virus, was intentionally introduced to wild rabbits in Europe and Australia to help reduce rabbit populations, and, sadly, the virus has continued to spread to the pet rabbits also. The myxoma virus has many strains. The US West Coast strain is the most deadly, killing 99% of infected rabbits.
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This virus can spread by direct contact with infected rabbits or contact with food, bedding, housing, and water bottles/bowls of an infected rabbit.
Myxomatosis can also spread via bites of blood-sucking insects such as mosquitoes, fleas, flies, lice, and mites.
Clinical symptoms typically develop within 14 days of exposure and can include:
Many times a presumptive diagnosis can be made based on clinical symptoms and your geographic location.
Biopsy samples of tissues or swabs of the eyes and nose can be sent to the lab to confirm the virus is present.
There is no cure for myxomatosis in rabbits and it is often fatal to pet rabbits. Euthanasia is often discussed and recommended in sick rabbits due to a very poor prognosis for recovery.
If treatment is elected, it is based on supportive care for the rabbit. This includes assisted feedings, intravenous fluids to maintain hydration, antibiotics to treat secondary infections, pain medications, and keeping the rabbit isolated from other rabbits since this is a contagious disease.
Sadly, the fatality rate in the US is 99%, so it is very rare for a pet rabbit to survive a myxomatosis infection.
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