Rabbit Hemorrhagic Disease

Rabbit Hemorrhagic Disease, commonly called RHD or RHDV, is a highly contagious viral infection that attacks the liver and causes widespread internal bleeding in rabbits. It is one of the most lethal diseases a rabbit can contract, with mortality rates that frequently exceed ninety percent in unvaccinated populations. If that number sounds alarming, it should. RHD is the kind of disease that can take a perfectly healthy rabbit and kill her within twenty-four to seventy-two hours of exposure, sometimes with so few outward signs that an owner finds their rabbit dead with no warning at all.

There are two main strains of the virus that rabbit owners need to know about. The original RHDV1 was identified decades ago and primarily affected adult rabbits while typically sparing kittens under eight weeks. The newer variant, RHDV2, emerged more recently and is both more widespread and more dangerous because it affects rabbits of all ages, including young kittens, and has a somewhat longer incubation period that allows more time for the virus to spread before anyone realizes it is present. RHDV2 is the strain that has been spreading across North America and causing outbreaks that devastate both wild and domestic rabbit populations.

The severity of RHD is difficult to overstate. This is not a disease where you have time to watch and wait, try home remedies, or hope for the best. Infected rabbits develop massive liver failure and disseminated intravascular coagulation, which is a condition where the blood clotting system essentially goes haywire, causing simultaneous clotting and bleeding throughout the body. Death often occurs so rapidly that the first sign of illness is finding a rabbit who was fine at breakfast lying dead by afternoon. In peracute cases, there are literally no observable symptoms before death.

Rabbits are the primary hosts for RHDV, though some related species like hares can also be affected depending on the strain. Domestic rabbits living indoors are not immune to this disease despite what some owners assume. The virus is incredibly hardy in the environment and can survive on surfaces, in soil, on clothing, and on the soles of shoes for weeks to months. You do not need to have your rabbit in direct contact with an infected animal to bring this virus into your home.

This article explains how RHD spreads, what signs to watch for, what limited treatment options exist, and most importantly how vaccination provides the strongest protection available for your rabbits.

Rabbit Hemorrhagic Disease is caused by a calicivirus that targets the liver with devastating efficiency. The virus enters through oral or nasal routes and replicates rapidly in the liver, destroying hepatocytes and triggering the coagulation cascade that produces the hemorrhaging for which the disease is named. The incubation period ranges from one to five days for RHDV1 and can extend slightly longer for RHDV2, during which time an infected rabbit can be shedding virus and contaminating her environment without showing any outward signs of illness.

The transmission routes for RHDV are what make it so terrifyingly effective at spreading. Direct contact between infected and susceptible rabbits is the most obvious path, but the virus does not require direct contact to reach your rabbits. It can travel on contaminated hay, feed, bedding, clothing, shoes, and equipment. Insects including flies and mosquitoes can carry the virus mechanically between locations. Wild rabbits dying of RHD in your neighborhood can contaminate the ground, vegetation, and water sources that connect to your property. Even well-intentioned visitors who have been around other rabbits can bring the virus into your home on their hands or clothing.

Geographic risk varies, but RHDV2 has been confirmed in wild and domestic rabbit populations across a growing number of regions in North America, Europe, Australia, and elsewhere. Outbreaks tend to appear suddenly when the virus reaches a new area, and because the disease kills so quickly, entire colonies of wild rabbits can be eliminated before anyone realizes what is happening. If you live in or near an area where RHD has been confirmed, the risk to your domestic rabbits is real and immediate.

All unvaccinated rabbits are at risk regardless of whether they live indoors or outdoors, alone or in groups, in urban areas or rural settings. Outdoor rabbits face higher risk due to greater exposure to wild rabbits, insects, and contaminated environmental surfaces. Indoor rabbits are at lower risk but are not safe, because you can bring the virus inside on shoes, groceries, garden produce, or anything else that contacted a contaminated surface. Multi-rabbit households face amplified risk because once the virus enters, it spreads quickly through the group.

Rabbits who survive RHD infection - and a small percentage do - can shed the virus for weeks afterward, making them a continued risk to unvaccinated rabbits in the area. There is some evidence that recovered rabbits develop immunity, but relying on natural infection as a protection strategy would be absurd given the mortality rate. Vaccination is the only rational approach to managing this risk.

The cruelest aspect of RHD is that many rabbits die with little to no warning. In the peracute form of the disease, a rabbit may be eating, playing, and behaving completely normally and then be found dead hours later. Owners of rabbits who die from peracute RHD often describe finding their rabbit in a position that looks like she simply fell over, sometimes with a small amount of blood visible at the nose or mouth. There is no window for intervention in these cases because the disease progressed from initial infection to fatal organ failure faster than symptoms could develop.

When symptoms do appear, they typically develop rapidly over twelve to thirty-six hours and reflect the catastrophic liver failure and coagulation problems caused by the virus. Early signs include sudden lethargy, loss of appetite, and a fever that you may not detect without a thermometer. Some rabbits become restless, anxious, or vocalize in ways that are unusual for them. These early symptoms are not specific to RHD and could indicate many other conditions, which is part of what makes early diagnosis so difficult.

As the disease progresses, more distinctive signs emerge. Bleeding from the nose, mouth, or rectal area occurs as the coagulation system fails and the body can no longer control hemorrhaging. The rabbit may develop jaundice, visible as a yellowing of the ears, eyes, or mucous membranes, reflecting the severe liver damage. Neurological signs including convulsions, paddling movements, and opisthotonos - where the head arches backward - can occur in the terminal stages as toxins accumulate in the blood and affect the brain.

Some rabbits with the subacute form of RHDV2 develop a more prolonged illness lasting several days, with lethargy, poor appetite, and jaundice as the primary features. These rabbits may appear severely ill rather than dying suddenly, and they sometimes survive with intensive supportive care, though liver damage may leave lasting effects. The subacute presentation is somewhat more common with RHDV2 than with the original RHDV1 strain.

If you find one of your rabbits dead unexpectedly, particularly if you live in an area where RHD has been reported, contact your rabbit-savvy vet immediately and do not handle the body without gloves. If you have other rabbits, isolate them, disinfect everything you can, and discuss emergency vaccination with your vet. A sudden unexplained death in a rabbit should always raise the question of RHD until another cause is confirmed.

Diagnosing RHD in a living rabbit is challenging because the symptoms overlap with other conditions and the disease often kills before diagnostic testing can be completed. Your vet may suspect RHD based on the clinical presentation, your geographic location, known local outbreaks, and the rapidity of decline. Blood work in an affected rabbit may show severely elevated liver enzymes, low platelet counts reflecting the coagulation problems, and other abnormalities consistent with acute liver failure and disseminated intravascular coagulation.

Definitive diagnosis typically requires laboratory testing that detects the virus itself through PCR testing or identifies viral antigens in tissue samples. In living rabbits, liver biopsy can sometimes confirm the diagnosis, but the invasiveness of this procedure in an already critically ill rabbit limits its practical utility. Most definitive diagnoses are made post-mortem through necropsy and tissue testing, which is important not just for confirming what killed your rabbit but for alerting authorities and other rabbit owners in your area to the presence of the virus.

There is no specific antiviral treatment for RHD. This is a critical point that every rabbit owner needs to understand. Once a rabbit is infected, there is no medication that kills the virus or reverses its effects on the liver. Treatment is entirely supportive and aimed at giving the rabbit's immune system time to fight the infection while managing symptoms. Supportive care includes intravenous fluids to maintain hydration and support organ function, medications to manage pain and nausea, assisted feeding if the rabbit will accept food, and sometimes blood products or medications that support the clotting system.

Pain management in a rabbit with RHD is focused on keeping her as comfortable as possible during what is often a terminal illness. Liver failure causes significant discomfort, and seizures in the later stages are distressing for both the rabbit and the owner. Your vet will use appropriate pain medications and anti-seizure drugs as needed, and honest conversations about whether treatment is extending life or prolonging suffering are important throughout the process.

The survival rate for symptomatic RHD is low, particularly with RHDV1. RHDV2 carries a somewhat lower mortality rate, estimated around five to thirty percent lower than RHDV1 depending on the source, and the subacute form that occasionally develops with RHDV2 gives rabbits a slightly better chance of recovery with aggressive supportive care. Rabbits who do survive may have permanent liver damage that affects their long-term health and requires ongoing monitoring.

Because treatment options are so limited and outcomes are so poor, prevention through vaccination is overwhelmingly the most important strategy for dealing with RHD. Spending time and money on vaccination now prevents the heartbreak and helplessness of watching a rabbit die from a disease that was preventable.

Vaccination is the cornerstone of RHD prevention and the single most important step you can take to protect your rabbits from this disease. Several vaccines are available depending on your region, and your rabbit-savvy vet can advise which products are appropriate and what schedule to follow. In areas where RHDV2 is present, vaccination is strongly recommended for all pet rabbits regardless of whether they live indoors or outdoors. The vaccines are generally well tolerated, with most rabbits experiencing nothing more than mild soreness at the injection site and perhaps a day of reduced appetite.

Biosecurity measures complement vaccination by reducing the chances of bringing the virus into your home. Remove outdoor shoes before entering your rabbit's living area, or keep a separate pair of shoes that never go outside. Wash your hands before handling your rabbits, particularly after being in public spaces, visiting other rabbit owners, or handling produce from outdoor markets. If you attend rabbit shows, rescue events, or visit shelters, change your clothing and shower before interacting with your own rabbits. These precautions may feel excessive, but the environmental persistence of RHDV makes them genuinely worthwhile.

Insect control is another prevention layer, particularly during warmer months when flies and mosquitoes are active. Window screens, fly traps, and mosquito management around your property reduce the number of potential mechanical vectors that could carry the virus to your rabbits. Outdoor rabbits should have screened enclosures that minimize insect access, and eliminating standing water near rabbit housing reduces mosquito breeding sites.

If you live in an area where RHD has been confirmed in wild rabbit populations, take extra precautions with anything that comes from outdoors. Wash garden greens thoroughly before feeding them to your rabbits. Do not allow your rabbits to graze on lawns where wild rabbits have been seen. Store hay and feed in sealed containers that prevent contamination by insects or wildlife. These measures add up to a meaningful reduction in exposure risk when combined with vaccination.

In the event of a confirmed RHD case in your area or your own rabbitry, disinfection becomes critical. The virus is resistant to many common cleaning products, but sodium hypochlorite (bleach) at a ten percent concentration, potassium peroxymonosulfate products, and sodium hydroxide are effective. All surfaces, equipment, feeding dishes, and litter boxes that may have been exposed should be thoroughly cleaned and disinfected. Soft materials like bedding and fabric should be discarded rather than attempting to decontaminate them.

If your rabbit suddenly becomes lethargic, stops eating, or shows any signs of bleeding from the nose, mouth, or rectum, get to a rabbit-savvy vet immediately. While these signs can indicate conditions other than RHD, the possibility of hemorrhagic disease warrants emergency evaluation, especially if you live in an area where the virus has been reported. Do not wait to see if your rabbit improves on her own. The speed at which RHD progresses means that hours of delay can be the difference between a slim chance at survival and no chance at all.

If you find a rabbit dead unexpectedly, contact your vet even though treatment is no longer possible. Your vet can advise on whether necropsy and testing are appropriate, which helps confirm or rule out RHD and provides critical information for protecting your remaining rabbits and alerting the rabbit community in your area. Handle the deceased rabbit with gloves and place the body in a sealed bag until you receive guidance from your vet.

Contact your vet to discuss vaccination even if no outbreak has been reported in your immediate area. RHDV2 is expanding its geographic range, and by the time an outbreak is confirmed near you, the virus may have already been circulating for weeks. Proactive vaccination before the virus arrives is far more protective than reactive vaccination during an outbreak. Your vet can help you access appropriate vaccines and establish a vaccination schedule for all the rabbits in your care.

Stay connected with local rabbit rescue organizations, rabbit owner groups, and your state veterinarian's office for updates on RHD activity in your region. Early awareness of outbreaks near you allows you to increase biosecurity measures and ensure your rabbits' vaccinations are current. RHD is a reportable disease in many jurisdictions, meaning confirmed cases trigger official notifications that can alert you to nearby risk. Your rabbit community is your early warning system - stay plugged in.