Calicivirus Rabbits: RHDV and RHDV2 Explained
You hear about a deadly virus affecting rabbits. Healthy rabbits are dying suddenly. You worry about calicivirus rabbits. Calicivirus causes Rabbit Hemorrhagic Disease (RHD), a highly contagious and often fatal viral infection in rabbits.
According to the RSPCA, Rabbit Hemorrhagic Disease is one of the most serious viral diseases affecting rabbits. The House Rabbit Society emphasizes that vaccination is essential for protecting rabbits against this deadly virus. Calicivirus rabbits can cause sudden death with few warning signs.
This guide covers everything about calicivirus rabbits: what it is, how it spreads, signs to watch for, treatment options, and prevention strategies. For general illness signs, see sick bunny. For other rabbit diseases, see disease bunnies.
Calicivirus rabbits causes Rabbit Hemorrhagic Disease (RHD), a highly contagious and often fatal viral infection. RHDV and RHDV2 are the two main strains. Vaccination combined with good biosecurity offers the best protection.
What Is Rabbit Calicivirus
Rabbit calicivirus is a viral infection that causes Rabbit Hemorrhagic Disease (RHD). It is caused by the Rabbit Hemorrhagic Disease Virus (RHDV), a member of the Caliciviridae family. According to veterinary sources, this virus is highly contagious and often fatal in rabbits.
There are two main strains of the virus: RHDV (classic strain) and RHDV2 (the newer variant). RHDV2 emerged in the 2010s and has spread worldwide. RHDV2 differs from the classic strain by affecting younger rabbits and a wider range of lagomorph species.
Calicivirus rabbits is a major threat to both domestic and wild rabbit populations. The virus causes internal bleeding and liver damage. Death can occur within hours of infection. Mortality can be very high in unvaccinated rabbits, although it varies depending on the viral strain and outbreak.
The virus is extremely resilient. It can survive in the environment for months. It is resistant to many common disinfectants. This makes calicivirus rabbits difficult to control once it enters an area.
Rabbit calicivirus causes Rabbit Hemorrhagic Disease. RHDV and RHDV2 are the two main strains. RHDV2 differs from the classic strain by affecting younger rabbits and a wider range of lagomorph species.
Rabbit Hemorrhagic Disease Explained
Rabbit Hemorrhagic Disease is a severe viral infection caused by calicivirus rabbits. It primarily affects the liver and causes internal bleeding.
Rabbit hemorrhagic disease: RHD is a viral disease that causes hemorrhaging (bleeding) in internal organs. The liver is most severely affected. The disease progresses rapidly.
RHD in rabbits: RHD can cause sudden death. Infected rabbits may die within 12-36 hours of showing symptoms. Some rabbits die without any visible signs. According to veterinary sources, this makes calicivirus rabbits particularly dangerous.
Rabbit hemorrhagic virus: The virus spreads through direct contact with infected rabbits, contaminated materials, and insects. RHD spreads mainly through direct contact, contaminated materials (fomites), insects, scavengers, and short-range infectious droplets.
Viral hemorrhagic disease: RHD is a viral hemorrhagic disease. It causes bleeding in the liver, lungs, and other organs. The disease is often fatal without vaccination.
Fatal rabbit diseases: RHD is one of the most serious viral diseases in rabbits. According to veterinary sources, it is considered a notifiable disease in many countries.
Rabbit Hemorrhagic Disease is a severe viral infection causing internal bleeding. It can cause sudden death within hours. RHDV and RHDV2 are the two main strains responsible.
RHDV and RHDV2
Understanding the two strains of calicivirus rabbits is essential for effective protection. RHDV and RHDV2 differ in several important ways.
RHDV in rabbits: RHDV is the classic strain of Rabbit Hemorrhagic Disease Virus. It emerged in the 1980s. It primarily affects adult rabbits. Young rabbits under 8 weeks are often resistant.
RHDV2 in rabbits: RHDV2 is a newer variant that emerged in France in 2010. RHDV2 differs from the classic strain by affecting younger rabbits and a wider range of lagomorph species. According to veterinary sources, RHDV2 has spread worldwide and is now the dominant strain in many regions.
Rabbit hemorrhagic disease virus: Both RHDV and RHDV2 are caused by the same virus family but are genetically distinct. Vaccines are available for both strains.
RHDV strains: The two strains differ in their effects on different rabbit populations. RHDV2 affects younger rabbits and a wider range of lagomorph species.
Emerging rabbit diseases: RHDV2 is considered an emerging disease. It has caused significant outbreaks in wild rabbit populations. According to veterinary sources, it poses a serious threat to rabbit conservation.
RHDV and RHDV2 are the two main strains of calicivirus rabbits. RHDV2 is a newer variant that affects rabbits of all ages and has spread worldwide.
How Rabbits Catch Calicivirus
Understanding how calicivirus rabbits spreads helps you prevent infection. The virus can be transmitted through multiple routes.
Rabbit disease transmission: The virus spreads through direct contact with infected rabbits. RHD spreads mainly through direct contact, contaminated materials (fomites), insects, scavengers, and short-range infectious droplets.
Infected rabbits: Infected rabbits shed the virus in their urine, feces, and respiratory secretions. The virus can survive in the environment for months.
Contaminated food and bedding: The virus can contaminate hay, pellets, and bedding. It can also survive on surfaces like cages, food bowls, and water bottles.
Insects and scavengers: Insects like flies and fleas can transmit the virus. Scavengers can also spread the virus through contact with infected carcasses.
Short-range infectious droplets: The virus can be transmitted through short-range droplets from sneezing or coughing. According to veterinary sources, long-distance airborne spread is not considered the primary route.
For more on preventing disease transmission, see disease bunnies.
Calicivirus rabbits spreads through direct contact, contaminated materials, insects, scavengers, and short-range infectious droplets. The virus can survive in the environment for months.
Signs and Symptoms of Calicivirus
Recognizing the signs of calicivirus rabbits helps you seek treatment early. Symptoms can appear suddenly and progress rapidly.
Rabbit hemorrhagic disease symptoms: Symptoms include fever, lethargy, loss of appetite, and difficulty breathing. Infected rabbits may also show signs of abdominal pain.
Rabbit lethargy: Lethargy is a common early sign. A rabbit with RHD may be less active and sleep more than usual.
Rabbit loss of appetite: A rabbit with calicivirus may stop eating. Loss of appetite with other symptoms requires immediate attention.
Rabbit fever: Fever is a common symptom. A veterinarian can confirm fever during examination.
Rabbit breathing problems: Difficulty breathing is a serious sign. The rabbit may breathe through its mouth or make wheezing sounds.
Sick rabbit symptoms: Other signs include jaundice (yellowing of the eyes and skin) and neurological symptoms. In some cases, rabbits may die suddenly without showing any symptoms. If you notice any of these signs, contact your veterinarian immediately.
For more on recognizing a sick bunny, see sick bunny.
Signs of calicivirus include fever, lethargy, loss of appetite, and breathing problems. Some rabbits may die suddenly without any warning signs. Immediate veterinary attention is essential.
Rabbit Bleeding Symptoms
Some rabbits develop visible bleeding, particularly in advanced disease. Recognizing bleeding symptoms helps you seek emergency care.
Rabbit bleeding: Some rabbits develop visible bleeding, particularly in advanced RHD. It can occur from the nose, mouth, or internally. Many rabbits die without external bleeding.
Bleeding bunny: A bleeding rabbit needs immediate emergency care. Blood around the nose or mouth is a critical sign.
Nose bleeding in rabbits: Blood from the nose can occur in advanced RHD. It indicates severe internal bleeding.
Blood around mouth: Blood around the mouth can indicate internal bleeding. This is a sign of advanced disease.
Internal bleeding in rabbits: Internal bleeding is a severe complication of RHD. It can cause sudden death.
Hemorrhagic disease signs: Hemorrhagic signs indicate advanced RHD. Immediate veterinary care is essential. According to veterinary sources, rabbits with bleeding symptoms have a poor prognosis.
Advanced viral disease: Bleeding indicates advanced viral disease. Treatment may not be effective at this stage. Prevention through vaccination and biosecurity is the best approach.
For more on emergency signs, see how to know if your rabbit is dying.
Some rabbits develop visible bleeding, particularly in advanced disease. Many rabbits die without external bleeding. Immediate veterinary care is essential, but prognosis is often poor at this stage.
Effects on Wild Rabbits
Calicivirus rabbits has devastating effects on wild rabbit populations. Understanding the impact helps you appreciate the importance of vaccination and biosecurity.
Wild rabbit virus: RHDV and RHDV2 have caused significant declines in wild rabbit populations. According to veterinary sources, outbreaks have had major impacts on wild rabbit populations across Europe, Australia, and the Americas.
Rabbit population decline: Calicivirus rabbits has contributed to the decline of wild rabbit species. The virus has affected rabbits across multiple continents.
Wild rabbit diseases: RHD is one of the most serious diseases affecting wild rabbits. It has significant conservation impacts.
Rabbit conservation concerns: RHDV2 has raised conservation concerns. The virus affects endangered rabbit species. According to veterinary sources, it is a major threat to rabbit biodiversity.
Disease spread in wildlife: Wild rabbits can spread the virus to domestic rabbits. This makes biosecurity essential for pet rabbit owners.
RHDV and RHDV2 have caused significant declines in wild rabbit populations. The virus affects endangered species and is a major conservation concern.
Diagnosis of RHD
Diagnosing calicivirus rabbits requires veterinary testing. Accurate diagnosis is essential for confirmation and disease surveillance.
Rabbit veterinary diagnosis: A veterinarian will examine your rabbit for signs of RHD. They will check for fever, lethargy, and bleeding symptoms.
Postmortem testing: Diagnosis is often made through postmortem examination. The virus can be detected in liver tissue.
Rabbit disease confirmation: Laboratory testing is required to confirm RHD. PCR testing can detect the virus in blood or tissue samples.
Laboratory testing: PCR testing is the most reliable method for diagnosing RHD. It can distinguish between RHDV and RHDV2.
Rabbit health investigations: If RHD is suspected, your vet may recommend testing for confirmation. This is important for disease surveillance.
Diagnosis of RHD requires veterinary testing. Postmortem examination and PCR testing can confirm the presence of RHDV or RHDV2.
Treatment and Survival
Treatment for calicivirus rabbits is limited. Prevention through vaccination and biosecurity is the best approach.
Rabbit hemorrhagic disease treatment: There is no specific treatment for RHD. Supportive care may be attempted, but outcomes are poor.
Supportive care for rabbits: Supportive care includes fluid therapy and pain management. However, most rabbits with RHD do not survive.
Rabbit emergency treatment: Unfortunately, even with intensive supportive care, survival is often poor. The disease progresses too quickly.
Rabbit recovery chances: Recovery from RHD is rare. Vaccination combined with good biosecurity offers the best protection.
Veterinary intervention: Veterinary intervention may be attempted but is rarely successful. Prevention through vaccination and biosecurity is essential.
For more on emergency care, see how to know if your rabbit is dying.
There is no specific treatment for RHD. Unfortunately, even with intensive supportive care, survival is often poor. Vaccination combined with good biosecurity offers the best protection.
Prevention and Vaccination
Vaccination combined with good biosecurity offers the best protection against calicivirus rabbits. Good biosecurity also reduces the risk of infection.
Rabbit hemorrhagic disease vaccine: Vaccines are available for RHDV and RHDV2. According to veterinary sources, vaccination is essential in areas where the virus is present.
Rabbit vaccination: Follow your veterinarian's recommended vaccination schedule. Some vets recommend annual vaccination, while others may suggest different schedules based on regional risk.
Preventing RHDV: Prevention includes vaccination and biosecurity. Keep rabbits indoors or in secure enclosures.
Rabbit biosecurity: Practice good hygiene. Wash hands before handling rabbits. Quarantine new rabbits. Avoid contact with wild rabbits. Control insects and scavengers.
Protecting pet rabbits: Protect pet rabbits by vaccinating them. Keep them indoors or in secure enclosures. Avoid contaminated food and bedding.
Outdoor rabbit safety: Outdoor rabbits are at higher risk. Secure enclosures can protect against contact with wild rabbits. Insect control is also important.
For more on rabbit care, see ideal rabbit cage and rabbit in cages.
Vaccination combined with good biosecurity offers the best protection against calicivirus rabbits. Follow your veterinarian's recommended vaccination schedule. Good biosecurity and hygiene also reduce the risk of infection.
Final Thoughts
Calicivirus rabbits causes Rabbit Hemorrhagic Disease, a highly contagious and often fatal viral infection. RHDV and RHDV2 are the two main strains. Both are serious threats to rabbit health.
The virus spreads through direct contact, contaminated materials, insects, scavengers, and short-range infectious droplets. It can survive in the environment for months. Wild rabbits can also spread the disease. Vaccination combined with good biosecurity offers the best protection.
RHD can cause sudden death with few warning signs. Symptoms include fever, lethargy, and bleeding from the nose or mouth in some cases. Many rabbits die without external bleeding. There is no specific treatment. Prevention through vaccination and biosecurity is essential.
For more information on rabbit health, see our guides on sick bunny, disease bunnies, and rabbit in cages.
Trusted Resources for RHD Information
- RSPCA Rabbit Health Guide – Expert advice on rabbit health and RHD
- House Rabbit Society Health – Comprehensive health information for pet rabbits
- PDSA Rabbit Vaccinations – UK veterinary charity guidance on RHD vaccination
- Cornell University Rabbit Health – Veterinary research-based health information
- Humane Society Rabbit Care – General rabbit care and health guidance
