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Leaping Across the U.S.: Rabbit Hemorrhagic Disease

Katie Loberti Animal Health, Livestock diseases, Risk assessment Leave a Comment

Imagine walking into a rabbitry one day and noticing multiple rabbits dead with nothing other than a little bit of blood on their nose. A highly contagious foreign animal disease by the name of rabbit hemorrhagic disease (RHD) is on the rise nationally, and is causing many rabbit farmers and owners to fear for their stock and pets. While it poses no threat to humans, the disease can be deadly to rabbits.

What is RHD?

RHD is preceded by just a few symptoms like reluctance to eat, fever, difficulty breathing or seizures. It is can be a silent killer that leaves rabbits suddenly dead with only blood-stained noses (U.S. Department of Agriculture, 2020). The RHD virus is non-enveloped, difficult to detect, and can survive on carcasses in mild or extreme climates. These characteristics explain why RHD can be transmitted directly (animal-to-animal) as well as indirectly. For example, farmers walking around their property can indirectly track back the disease to their own rabbits if they come into contact with grass contaminated by feces or urine from a wild rabbit with RHD. To learn more about methods of animal disease transmission, visit the Healthy Farm Healthy Agriculture website’s routes of infection learning module.

While an onslaught of RHD is sudden and often devastating, some signs to look out for in an infected animal include:

  • Poor appetite
  • Depression, lethargy or listlessness
  • Fever
  • Bloody nasal discharge

Weight loss, bloating, diarrhea, respiratory disease and jaundice are indicative of organ failure, which comes in the later stages of the disease (Washington Department of Agriculture, 2020). Contact a veterinarian immediately if there are any sudden deaths or any of the signs listed above.

Where is RHD Found?

Outbreaks of rabbit hemorrhagic diseases (RHDs) are not uncommon. One of the first-ever diagnoses of RHD occurred in China in 1984 (Washington Department of Agriculture, 2020). In 2019, there was an RHD outbreak in the State of Washington and in the adjacent Canadian islands. This year, RHD is spreading through several states, but the virus strain in the southwestern United States is different from the one found in Washington. Since March 2020, cases have been confirmed in:

  • Arizona
  • California
  • Colorado
  • New Mexico
  • Nevada
  • Texas
  • Utah
  • Northern Mexico.

The current strain of RHD (RHDV2) is the first to be deadly to both domestic and wild rabbits (House Rabbit Society, 2020). A map with the locations of RHD cases can be viewed on the USDA APHIS website.

Biosecurity to Protect Rabbits and Prevent RHD Spread

Biosecurity practices can prevent RHD in rabbits, whether they are raised for pets or sale. The following steps will help to keep animals safe and healthy:

  • Wash hands before and after coming into direct contact with rabbits (wild or domestic) or entering a rabbitry.
  • Frequently sanitize and disinfect equipment used for the care or holding of rabbits. Phenolics or 10 percent bleach are recommended. For help on how to read a disinfectant product label correctly, read this guide from the Center for Food Security and Public Health.
  • Do not allow contact between domestic and wild rabbits.
  • Have all workers and visitors wear protective clothing such as gloves, coveralls, shoe and hair coverings.
  • Isolate any new animals or animals that have been off of the premises for 30 days. Use separate equipment for these animals during the isolation period.
  • If possible, avoid taking rabbits to shows because it might put them at risk for infection. As of June 26, 2020, the state veterinarian of Oklahoma has banned rabbit exhibitions for the time being.
  • Do not feed grass that could be contaminated or use branches for bedding if they were found outside.
  • Remove dead rabbits in a rabbitry immediately and submit them to a veterinarian for examination.
  • Keep rabbits indoors as much as possible.

In addition to following those steps, it is crucial to report any cases of dead wild rabbits to local and state veterinarians: avoid all direct contact with dead wild rabbits if possible. Wildlife professionals investigating deaths of wild rabbits are urged to practice strict biosecurity to avoid spreading the virus.

While there is no commercially available vaccine for RHD in the United States, there are three vaccines available in Europe. Two of these vaccines (Filavac and Eravac) may be used in the United States in the case of an emergency if a permit is acquired. (United States Department of Agriculture, 2020). Additional details about vaccines can be found in this RHDV2 FAQ sheet by the USDA. If you would like more information or to inquire about vaccinating rabbits against RHD in the United States, contact your local or state veterinarian.

It is disturbing to think that livestock or pets can be healthy one day but gone the next. However, even highly contagious and high consequence diseases can be managed with the right biosecurity practices. To learn about assessing the risk of diseases and how to lessen these risks, take the biosecurity risk assessment on the Healthy Farms Healthy Agriculture website.

References

House Rabbit Society (2020, June 18). Rabbit Hemorrhagic Disease Virus (RHDV).
Retrieved from https://rabbit.org/rhdv/

U.S. Department of Agriculture, Animal and Plant Health Inspection Services (2020). Rabbit Hemorrhagic Disease [Fact sheet].
Retrieved from https://www.aphis.usda.gov/publications/animal_health/fs-rhdv2.pdf

U.S. Department of Agriculture, Animal and Plant Health Inspection Services (2020). Rabbit Hemorrhagic Disease [FAQ’s].
Retrieved from https://www.aphis.usda.gov/animal_health/downloads/faq-rhd-vaccine.pdf

Washington State Department of Agriculture (2020). Rabbit Hemorrhagic Disease [Fact sheet].
Retrieved from https://cms.agr.wa.gov/getmedia/07915d2d-bfd5-4cbb-b443-ab3b42b72722/RHDFactsheet

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About the Author
Katie Loberti

Katie Loberti

Katie Loberti is a junior undergraduate student at the University of Vermont pursuing a bachelor's degree in animal science. In the past, she worked as a park naturalist at Burlingame State Park in Rhode Island, which allowed her to grow and share her knowledge and passion for wildlife in New England with others. She also volunteered at Biomes Marine Biology Center in Rhode Island which helped her discover her love for aquatic life. At the University of Vermont, Katie is an active member of the women's rugby club. In the future, Katie hopes to pursue veterinary medicine or do work with animal conservation and education.

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Joanna Cummings

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Joanna Cummings received a Bachelor of Science in Horticulture from The Pennsylvania State University, with a specialization in vegetable crop and greenhouse production. At PSU, she worked for the Professor of Plant Nutrition as a research technician on no-till vegetable crop experiments at the horticulture research facility, and as a greenhouse assistant in the All-American Selections Research Gardens. Her career in the agriculture industry includes work on dairy and vegetable farms, and as a greenhouse manager, estate gardener, landscaper and market garden entrepreneur. Joanna transitioned into the communications field after receiving a Master of Science in Environmental Studies, with a major in Communications, from Antioch University New England. At Antioch she worked as a field botany laboratory teaching assistant and manager of the herbarium. Joanna’s communications work experience includes agriculture education and outreach coordinator, marketing manager, director of communications, public information officer, webmaster, training program manager and project manager for nonprofit, government, academic and commercial organizations. She is currently working with Animal Disease Biosecurity Coordinated Agricultural Project (ADBCAP) Director Julie M. Smith, DVM, PhD, as a communications professional in the University of Vermont Animal and Veterinary Sciences Department. She is also the webmaster for the Healthy Farms Healthy Agriculture website.

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Dr. Julie Smith

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Julie Smith DVM, PhD, is a research associate professor at the University of Vermont. Julie received her B.S. in Biological Sciences, D.V.M., and Ph.D. in Animal Nutrition at Cornell University. Since joining the Department of Animal and Veterinary Sciences in 2002, she has applied her veterinary background to programs in the areas of herd health, calf and heifer management, and agricultural emergency management. She is responsible for teaching the undergraduate Animal Welfare class required of majors in her department. Julie has conducted trainings for Extension educators, livestock producers, and community members on the risks posed by a range of animal diseases, whether they already exist in the United States, exist outside of the United States, or pose a risk to both animal and human health. In all cases, she emphasizes the importance of awareness and prevention. As a veterinarian and spouse of a dairy farmer, Julie is well aware of the animal health and well-being concerns of dairy animals. She is currently leading the Animal Disease Biosecurity Coordinated Agricultural Project (ADBCAP), a multi-species, multi-state project looking at the human behavioral aspects of implementing practices to protect animal health and food security.

 

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