RHDV Vaccine

Rabbit Hemorrhagic Disease Virus, commonly called RHDV, is one of the most devastating diseases a rabbit can face, and the vaccine against it is hands down the most important preventive measure available to rabbit owners today. The virus kills quickly, often within 24 to 72 hours of the first symptoms appearing, and in many cases rabbits die without showing any symptoms at all. If you have rabbits and you have not looked into the RHDV vaccine yet, this is the article that should move you to pick up the phone and call your vet.

The RHDV vaccine has been widely used in Europe and Australia for years, but availability in the United States has been more complicated. For a long time American rabbit owners had limited or no access to an approved vaccine, which left their animals completely unprotected against a virus that was already present in wild rabbit populations across multiple states. That situation has improved significantly, and today there are vaccine options available through rabbit-savvy veterinarians, though you may need to do some legwork to find one who carries it.

The severity of RHDV cannot be overstated. This virus has a mortality rate that can exceed 90 percent in unvaccinated rabbits. It spreads through direct contact with infected rabbits, through contaminated objects like shoes, clothing, and hay, and even through insects that have contacted infected animals. Your rabbit does not need to go outside or meet another rabbit to be at risk. You can carry the virus home on your shoes after walking through an area where an infected wild rabbit has been.

Rabbits are prey animals, and their instinct to hide illness means that by the time you notice something is wrong with RHDV, it is almost always too late for treatment. This is not a disease where you have days to weigh your options. Prevention through vaccination is genuinely the only reliable protection, because once symptoms appear, supportive care is about all that can be offered, and most rabbits do not survive.

This article covers what the RHDV vaccine is, how it works, which rabbits should receive it, what the vaccination schedule looks like, and what you should know about potential side effects and availability. Whether you have one house rabbit or a barn full of them, this information matters.

The reason the RHDV vaccine exists in the first place is that the virus behind the disease is extraordinarily contagious and almost universally fatal in unvaccinated rabbits. RHDV is caused by a calicivirus, and the most concerning strain currently circulating is RHDV2, which affects both domestic and wild rabbit species. Unlike the original RHDV strain which primarily killed adult rabbits, RHDV2 can kill rabbits of any age including young kits, making vaccination even more critical.

The primary risk factor for any rabbit is simply being unvaccinated. That sounds obvious, but many rabbit owners still do not realize that a vaccine is available or assume their indoor rabbit is safe. The virus is incredibly stable in the environment and can survive on surfaces for months. It resists freezing, tolerates heat, and is not easily killed by common household disinfectants. This environmental persistence means the virus can be tracked into your home on shoes, clothing, packages, or even fresh vegetables purchased from a market where contaminated produce was handled.

Geographic location plays a role in risk assessment, but the reality is that RHDV2 has been confirmed in wild rabbit populations across a growing number of states and Canadian provinces. If you live in an area with confirmed cases, vaccination is urgent. If you live in an area without confirmed cases, vaccination is still strongly recommended because the virus is spreading and detection in wild populations often lags behind actual presence.

Rabbits who spend any time outdoors, whether in exercise pens, hutches, or free-ranging setups, face higher exposure risk because of potential contact with wild rabbit droppings, contaminated grass, or insects that have fed on infected animals. Flies and mosquitoes can mechanically transmit the virus, which means even a screened porch does not guarantee complete protection. Multi-rabbit households face additional risk because if one rabbit contracts the virus, transmission to housemates happens rapidly.

Rabbits with compromised immune systems, those who are elderly, or those under stress from other health conditions may be more vulnerable to the virus if exposed, though RHDV2 kills healthy rabbits in their prime just as readily. Rabbits who attend shows, travel for breeding, or board at facilities face elevated exposure risk due to contact with rabbits from different geographic areas and unknown vaccination histories. Even well-managed facilities can become transmission points if biosecurity protocols are not rigorous.

The bottom line on risk factors is straightforward - any unvaccinated rabbit is at serious risk, and the only reliable way to reduce that risk is vaccination.

This section covers the signs and symptoms of RHDV itself, because understanding what the disease looks like helps you understand why vaccination matters so much. The cruel reality of RHDV is that many rabbits show no symptoms at all before dying. This peracute form of the disease kills so rapidly that owners find their apparently healthy rabbit dead in their enclosure with no warning. That alone should tell you everything you need to know about why prevention is the only real strategy.

In cases where symptoms do appear before death, the most common early signs include lethargy, loss of appetite, and fever. Your rabbit may seem quieter than usual, reluctant to move, or uninterested in food that would normally get an enthusiastic response. These early signs can look like many other conditions, which is part of what makes RHDV so difficult to catch in time. By the time more specific symptoms develop, the disease has usually progressed beyond the point where intervention can help.

More advanced symptoms can include difficulty breathing, nasal discharge that may be bloody, and neurological signs like seizures, stumbling, or sudden collapse. Some rabbits develop jaundice, which shows as yellowing of the ears, eyes, or skin. Bloody discharge from the nose or mouth is a particularly alarming sign that indicates severe internal hemorrhaging. Not all rabbits show all of these signs, and some may only display one or two before succumbing.

Regarding the vaccine itself, the side effects are typically mild and temporary. Most rabbits experience nothing more than slight soreness at the injection site and perhaps a day of being a little quieter than usual. Some rabbits develop a small lump at the injection site that resolves on its own within a week or two. Serious adverse reactions are rare. Compared to the disease the vaccine prevents, these minor and temporary side effects are essentially a non-issue.

If your rabbit has been vaccinated and you notice mild lethargy or reduced appetite for a day after the injection, that is a normal immune response and not cause for alarm. However, if your unvaccinated rabbit shows any of the symptoms described above, particularly lethargy combined with loss of appetite and any respiratory signs, you need to contact your vet immediately while keeping that rabbit isolated from any other rabbits in your home.

The diagnosis of RHDV in a living rabbit is challenging because the symptoms overlap with many other conditions and the disease progresses so quickly that there is often little time for diagnostic workups. In most cases, RHDV is confirmed through post-mortem examination, which reveals characteristic liver damage and widespread hemorrhaging. For living rabbits showing suspicious symptoms, your vet may submit blood samples or swabs for PCR testing, but results often come back after the rabbit has already died or recovered.

There is no specific treatment for RHDV. That sentence deserves to sit with you for a moment, because it is the entire reason vaccination matters so much. Once a rabbit is infected, veterinary care is limited to supportive measures - fluids to maintain hydration, medications to manage fever and pain, nutritional support through syringe feeding, and keeping the rabbit as comfortable as possible. Some rabbits survive, particularly with aggressive supportive care, but the mortality rate remains extremely high even with veterinary intervention.

The treatment for RHDV, in a real and practical sense, is the vaccine. A rabbit-savvy vet will administer the vaccine as a subcutaneous injection, typically in the scruff of the neck. The initial vaccination protocol usually involves a primary dose followed by a booster, with the specific timing depending on which vaccine product your vet carries. Annual boosters are generally recommended to maintain protection, though your vet may adjust this schedule based on local disease pressure and the specific vaccine used.

For rabbits in the United States, the most commonly available vaccine is the Medgene RHDV2 vaccine, though availability can vary by region and veterinary practice. Some vets may carry imported vaccines from European manufacturers. The important thing is not which specific product your vet uses, but that your rabbit receives vaccination from a qualified professional who understands rabbit medicine.

Pain management after vaccination is rarely necessary since most rabbits tolerate the injection well. If your rabbit seems sore or uncomfortable at the injection site, a gentle cool compress can help, but avoid giving any pain medications without consulting your vet first. Some medications that are safe for dogs and cats are toxic to rabbits.

The cost of RHDV vaccination varies by location and veterinary practice, but typically runs between 25 and 75 dollars per dose. When you weigh that against the cost of emergency veterinary care for a critically ill rabbit, or against the reality of losing your rabbit to a preventable disease, vaccination is one of the most straightforward investments you can make in your rabbit's health.

Home care after vaccination is simple because most rabbits barely notice they have been vaccinated. Keep an eye on the injection site for a day or two, watching for excessive swelling, heat, or discharge that might indicate an infection, though this is uncommon. If your rabbit seems a little subdued the evening after their vaccine, offer their favorite treats and a quiet space to rest. Most rabbits are completely back to normal within 24 hours.

Prevention beyond vaccination includes biosecurity measures that reduce your rabbit's exposure to the virus in the first place. Change your shoes before entering the area where your rabbits live, especially if you have been walking in areas where wild rabbits are present. Wash your hands thoroughly before handling your rabbits, particularly if you have been at a pet store, farm supply shop, or any location where you might have contacted contaminated surfaces. If you bring in hay, greens, or other supplies from outdoor sources, consider the possibility that these items have been exposed to wild rabbit droppings.

Insect control matters more than many rabbit owners realize. Flies and mosquitoes can carry the virus mechanically on their bodies, so screening outdoor enclosures and managing insect populations around your rabbit area provides an additional layer of protection. This does not replace vaccination, but it complements it.

If you have multiple rabbits, keeping new arrivals quarantined for at least two weeks before introducing them to your established rabbits gives you time to observe for signs of illness. This quarantine period is good practice regardless of RHDV, as it also helps catch other contagious conditions. New rabbits should ideally be vaccinated and have their initial immunity established before joining your group.

Staying informed about RHDV2 cases in your area helps you gauge your local risk level and decide whether additional precautions are warranted. Your state veterinarian's office, the House Rabbit Society, and rabbit rescue organizations often share updates about confirmed cases. Even if your area has not reported cases, maintaining vaccination and basic biosecurity gives you peace of mind that your rabbits are protected against a threat that could arrive without warning.

If your rabbit is not yet vaccinated against RHDV, schedule an appointment with a rabbit-savvy vet as soon as you can. This is not something to put on a list for later. The disease is present in wild rabbit populations across much of North America, and your rabbit's protection depends entirely on getting that vaccine before exposure happens. Call your vet and specifically ask whether they carry or can order the RHDV2 vaccine.

If your rabbit has been vaccinated and develops a lump at the injection site that persists for more than two weeks, or if the injection site becomes hot, red, or produces discharge, contact your vet for an evaluation. These complications are uncommon but should be addressed. Similarly, if your rabbit shows prolonged lethargy, loss of appetite lasting more than a day after vaccination, or any unusual symptoms in the days following their shot, a quick call to your vet can help determine whether a visit is needed.

If you have an unvaccinated rabbit showing sudden lethargy, appetite loss, difficulty breathing, or any bloody discharge from the nose or mouth, this is an emergency. Contact your vet immediately and let them know you suspect possible RHDV exposure so they can take appropriate precautions. Isolate the affected rabbit from any other rabbits in your home right away.

Finding a vet who is knowledgeable about rabbit medicine and carries the RHDV vaccine can take some effort, especially in areas where exotic animal medicine is less common. The House Rabbit Society maintains a veterinarian listing on their website, and local rabbit rescue groups often have recommendations. Do not settle for a vet who is unfamiliar with rabbits just because they are convenient. Rabbit medicine requires specialized knowledge, and a vet who understands rabbits will provide better guidance on vaccination schedules, dosing, and overall preventive care.