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Rabbit Hemorrhagic Disease Fact Sheet

Rabbit Hemorrhagic Disease (RHD) is a highly contagious viral disease that can affect both domestic and wild rabbit species. This disease is nearly always fatal and primarily affects adult rabbits. The viral agent, Rabbit Hemorrhagic Disease Virus (RHDV), is a calicivirus with two strains, RHDV-1 and RHDV-2, being reported in North America in recent years. RHDV-2 is known to affect wild rabbits. RHD is a Foreign Animal Disease (FAD), but has been detected in Canada, Washington and Ohio. Since March 23rd, detections of the disease in both wild and domestic rabbits have occurred in New Mexico, Arizona, Colorado and Mexico. The first confirmed case in Texas was a domestic rabbit in Hockley County on April 10, 2020. The disease has since been confirmed in wild rabbits in Lubbock and Hudspeth Counties. There have been reports of mortality events in both wild cottontails (genus Sylvilagus) and jackrabbits (genus Lepus) in El Paso, Brewster, Hudspeth, Terrell, Lubbock and Pecos Counties.

Situation update 5/13/2020

Two new confirmations of rabbit hemorrhagic disease virus 2 (RHDV2) have been received by the Texas Animal Health Commission in domestic rabbits, one on a Lubbock County premises and one on a Midland County premises. RHDV2 has been confirmed in domestic rabbits in El Paso, Hamilton, Hockley, Lampasas, Lubbock, and Midland counties. Texas Parks and Wildlife Department has confirmed RHDV2 in the wild rabbit population of El Paso, Hockley, Hudspeth, Jeff Davis, Lubbock, Pecos, Randall, and Terrell counties.

More information can be found on TAHC Rabbit Hemorrhagic Disease Situational Updates.

 

Species Affected: Currently, RHDV appears only to affect rabbit species (lagomorphs). It is not known to affect humans, domestic livestock or pets (other than pet rabbits).

Clinical Signs: Often the only clinical sign is sudden death. In less acute cases, clinical signs may include the following: dullness/apathy, not eating, ocular and/or nasal hemorrhage and congestion of the conjunctiva. Some may develop neurological signs such as incoordination, excitement or seizure like episodes. Infections in young rabbits are usually sub-clinical and deaths are rare.

Transmission: The virus is shed in feces and other body fluids. Transmission may occur directly from animal to animal through ingestion, inhalation and mucous membranes. It may also spread indirectly by contaminated feed, water, clothing, equipment, waste, infected carcasses and insects. Potentially predators and scavengers that consume infected rabbits could mechanically spread the virus or excrete it in feces. The virus is very hardy and capable of surviving for extended periods of time in the environment and is resistant to extreme temperatures. The incubation period is thought to be 3-9 days.

Prevention: Domestic rabbits should be housed indoors if possible. Strict biosecurity should be practiced including cleaning and disinfecting cages and equipment; do not allow contact with other rabbits, wild or domestic; do not allow visitors in rabbitries or to handle rabbits, wear protective clothing (coveralls, shoe covers, gloves, etc.) when handling rabbits and change afterwards; control insects, birds, rodents and other animals that might serve as vectors and remove and properly dispose of carcasses promptly. Consult your local veterinarian if you experience sudden deaths or symptoms of RHD among your rabbits. It is difficult, if not impossible, to control the disease in the wild. Handling or moving sick wild rabbits or carcasses should be avoided if possible, but if needed, follow good biosecurity including wearing protective clothing and cleaning and disinfection of tools and equipment.

Cleaning and Disinfection Recommendations:

Carcass Disposal: Deep burial, 3 feet recommended, or incineration.

Guidance for Rabbit Hunters:

Sources: