Rabbit Myxomatosis: Prevention and Management

Myxomatosis is a severe viral disease of domestic and wild rabbits caused by the myxoma virus, a member of the poxvirus family. This article provides rabbit owners and veterinary professionals with evidence-based guidance on virus transmission, clinical recognition, vaccination strategies, and supportive care protocols. The information is drawn from peer-reviewed sources and official veterinary references to support practical management decisions in both pet and commercial rabbit settings.

At a Glance

Virus Transmission and Epidemiology

The myxoma virus is transmitted primarily through mechanical vectors. Blood-feeding arthropods including mosquitoes, fleas, and biting flies acquire the virus from infected rabbits and transfer it to susceptible animals during feeding. Direct contact with infected rabbits, contaminated bedding, feed, or water can also transmit the virus. The virus remains infectious in the environment for extended periods under cool, moist conditions. The Merck Veterinary Manual provides reference information on myxomatosis as a significant disease of rabbits.

Geographic distribution of myxomatosis varies. The disease is endemic in wild rabbit populations across Europe, Australia, and parts of the Americas. Outbreaks in domestic rabbits often follow seasonal patterns that correspond to vector activity peaks. A 30-year study of commercial rabbit farms in Spain documented persistent occurrence of myxomatosis alongside rabbit hemorrhagic disease, highlighting the ongoing challenge for producers as reported in Animals : an open access journal from MDPI. Spatiotemporal monitoring in Spanish Mediterranean ecosystems has shown that myxomatosis continues to circulate in wild rabbit populations, serving as a reservoir for domestic outbreaks as described in Transboundary and emerging diseases.

The myxoma virus originated in South American tapeti rabbits and was intentionally introduced to European rabbit populations in Australia and Europe as a biological control measure. The establishment and spread of myxomatosis and its effect on rabbit populations has been extensively documented in Philosophical transactions of the Royal Society of London. Series B, Biological sciences, with initial high mortality rates followed by evolutionary adaptation in both virus and host. Wild rabbit populations in England have demonstrated innate resistance to myxomatosis over successive generations as reported in the Journal of Hygiene, though domestic rabbits remain highly susceptible.

Vector Biology and Seasonal Patterns

Understanding vector behavior supports targeted prevention. Mosquitoes are most active during warm months, with peak activity at dawn and dusk. Flea populations increase in humid conditions and can persist indoors year-round. Biting flies are attracted to outdoor housing with poor sanitation. Record local vector activity patterns and correlate with myxomatosis cases in your area to time vaccination and vector control measures effectively.

Environmental Persistence

The myxoma virus survives in the environment for weeks to months under cool, moist conditions. Direct sunlight and high temperatures reduce survival time. Contaminated bedding, hutches, and equipment can serve as fomites. The virus resists drying and remains infectious in dried scabs and secretions. Thorough cleaning and disinfection are required to eliminate the virus from contaminated environments.

Clinical Signs and Disease Progression

Clinical presentation of myxomatosis depends on the viral strain, route of exposure, and host immune status. The classic nodular form begins with localized skin swelling at the site of inoculation, typically on the face, ears, or limbs. Within days, multiple subcutaneous nodules develop, progressing to severe swelling of the eyelids, ears, and genital region. Affected rabbits develop conjunctivitis with purulent ocular discharge, nasal discharge, and respiratory distress. The Revue scientifique et technique (International Office of Epizootics) provides a comprehensive review of myxomatosis pathology and clinical presentation.

The respiratory form of myxomatosis presents with severe pneumonia and pulmonary edema without prominent skin nodules. This form carries a higher case fatality rate and may be mistaken for other respiratory infections. Peracute myxomatosis causes sudden death with minimal premonitory signs, particularly in young or immunocompromised animals. The Schweizer Archiv fur Tierheilkunde describes the clinical spectrum of myxomatosis in rabbits.

Secondary bacterial infections commonly complicate myxomatosis. Pasteurella multocida and Staphylococcus aureus frequently invade compromised tissues, leading to pneumonia, abscess formation, and septicemia. Affected rabbits become anorexic, lethargic, and dehydrated. Mortality rates in unvaccinated domestic rabbits typically exceed 50 percent, with death occurring within 10 to 14 days of clinical onset.

Clinical Assessment Protocol

When examining a rabbit for possible myxomatosis, follow a systematic approach:

1. Observe from a distance for general demeanor, respiratory effort, and posture
2. Examine the face for eyelid swelling, conjunctival discharge, and nasal discharge
3. Palpate the body for subcutaneous nodules, particularly on the face, ears, and perineum
4. Assess the genital region for swelling and lesions
5. Check the feet and limbs for nodules or ulceration
6. Measure rectal temperature, heart rate, and respiratory rate
7. Assess hydration status by checking skin turgor and mucous membrane moisture
8. Evaluate appetite by offering preferred foods and observing intake

Record all findings with dates and times to track progression.

Differential Diagnosis Considerations

Several conditions can mimic myxomatosis. Rabbit hemorrhagic disease causes sudden death and respiratory signs but lacks skin nodules. Pasteurellosis presents with respiratory signs and conjunctivitis but typically without the characteristic skin swelling. Abscesses from bite wounds or foreign bodies produce localized swelling but do not progress to generalized disease. Allergic reactions to insect bites cause localized swelling that resolves without progression. Viral papillomatosis produces skin growths but without the systemic signs of myxomatosis. Veterinary diagnostic testing including PCR or virus isolation confirms the diagnosis.

Vaccination Strategies

Vaccination is the cornerstone of myxomatosis prevention in endemic regions. Several vaccine types are available, including live attenuated myxoma virus vaccines and combined vaccines that also protect against rabbit hemorrhagic disease. Vaccination protocols vary by product, manufacturer, and local regulatory approval. The World Organisation for Animal Health provides international standards for rabbit disease prevention including vaccination recommendations.

Vaccine Selection and Administration

Choose a vaccine that is licensed for use in your country and appropriate for the rabbit's age, health status, and risk exposure. Live attenuated vaccines provide rapid immunity but carry a small risk of vaccine-induced disease in immunocompromised animals. Combined vaccines offer convenience for simultaneous protection against myxomatosis and rabbit hemorrhagic disease.

Administer vaccines according to the manufacturer's label instructions. Most vaccines require subcutaneous injection, with the first dose given at 4 to 6 weeks of age. A booster dose is typically given 2 to 4 weeks later, followed by annual revaccination. In high-risk areas or during outbreaks, semiannual boosters may be recommended. The American Veterinary Medical Association provides general guidance on preventive veterinary care including vaccination protocols.

Vaccination Limitations

Vaccination does not provide complete protection against myxomatosis. Breakthrough infections can occur, particularly with heterologous viral strains. A study of pathogenic myxoma virus in vaccinated and non-vaccinated commercial rabbits documented that vaccinated animals can still develop disease, though clinical signs are typically milder and mortality is reduced as reported in Research in Veterinary Science. Vaccinated rabbits that become infected may shed virus and serve as a source of infection for other animals.

Vaccination is not a substitute for biosecurity measures. Even vaccinated rabbits require protection from vector exposure and isolation from potentially infected animals. Discuss vaccination protocols with a veterinarian familiar with local disease patterns and available products. The Association of Exotic Mammal Veterinarians provides resources for locating veterinarians with expertise in rabbit medicine.

Vaccination Record Keeping

Maintain individual vaccination records for each rabbit. Include the following information:

Store records in a secure location accessible for review during veterinary visits or disease investigations.

Biosecurity and Vector Control

Effective biosecurity reduces the risk of myxomatosis introduction and spread. Implement measures that address both direct and indirect transmission pathways.

Housing and Environmental Management

House rabbits in indoor enclosures or outdoor hutches with fine-mesh screening to exclude mosquitoes and biting flies. Use insect-proof netting over windows and ventilation openings. Remove standing water sources that serve as mosquito breeding sites. Maintain clean bedding and regular waste removal to reduce fly attraction.

Quarantine new rabbits for a minimum of 14 days before introducing them to existing animals. Use separate equipment, footwear, and clothing for quarantined animals. Monitor quarantined rabbits daily for signs of illness.

Vector Control Programs

Apply environmental insecticides and larvicides according to label directions to reduce vector populations. Use insect repellents approved for use around rabbits, applied to housing surfaces instead of directly to animals unless specifically labeled for that purpose. Consider biological control methods such as mosquito dunks containing Bacillus thuringiensis israelensis in water sources.

Control flea infestations on rabbits and in the environment. Consult a veterinarian for safe flea control products appropriate for rabbits. Avoid using dog or cat flea products that contain permethrin, which is toxic to rabbits.

Visitor and Equipment Protocols

Restrict visitor access to rabbit housing areas. Require hand washing and footbaths before entering rabbit facilities. Disinfect equipment between uses with a virucidal disinfectant effective against poxviruses. Sodium hypochlorite (bleach) at a 1:10 dilution, potassium peroxymonosulfate, and accelerated hydrogen peroxide products are effective when used according to label directions.

Biosecurity Checklist for Daily Operations

Implement the following biosecurity measures consistently:

• Change footwear or use footbaths before entering rabbit housing areas
• Wash hands with soap and water before and after handling rabbits
• Use dedicated clothing or coveralls for rabbit care
• Clean and disinfect equipment between uses
• Remove and properly dispose of dead rabbits promptly
• Control rodents and wild birds that may carry vectors
• Store feed in sealed containers to prevent contamination
• Treat water sources if surface water is used
• Maintain records of all animal movements onto the premises
• Post biosecurity signs at facility entrances

Supportive Care and Management

No specific antiviral treatment exists for myxomatosis. Supportive care aims to maintain hydration, nutrition, and comfort while the rabbit's immune system responds to the infection. Prognosis depends on viral strain virulence, host immune status, and the quality of supportive care provided.

Fluid Therapy and Nutritional Support

Dehydrated rabbits require fluid replacement. Offer fresh water and palatable fluids such as electrolyte solutions. Syringe-feed small amounts of water if the rabbit is unable to drink independently. In severe cases, subcutaneous or intravenous fluid therapy administered by a veterinarian may be necessary.

Anorexic rabbits require nutritional support. Offer high-fiber pellets, fresh hay, and leafy greens. Syringe-feed critical care formulas designed for herbivores if voluntary intake is inadequate. Monitor body weight daily and adjust feeding protocols accordingly.

Wound and Eye Care

Clean skin nodules and ulcerated areas with dilute antiseptic solutions. Apply topical antibiotic ointments to prevent secondary bacterial infection, using products approved for use in rabbits. Flush eyes with sterile saline solution to remove discharge. Apply ophthalmic antibiotic ointments if conjunctivitis is present.

Pain Management and Comfort

Rabbits with myxomatosis experience significant discomfort from skin lesions, swelling, and respiratory difficulty. Provide soft bedding and maintain a comfortable ambient temperature. Minimize handling stress. Consult a veterinarian for appropriate analgesic medications. Nonsteroidal anti-inflammatory drugs may be used under veterinary guidance, but avoid corticosteroids that can suppress immune function.

Isolation and Infection Control

Isolate affected rabbits from healthy animals to prevent virus spread. Use dedicated equipment and clothing for infected animals. Practice strict hand hygiene after handling. Disinfect housing areas thoroughly after recovery or death. The virus can persist in the environment, so thorough cleaning and disinfection are essential before reintroducing rabbits.

Monitoring Parameters for Affected Rabbits

Track the following parameters daily for rabbits receiving supportive care:

Record all observations in a treatment log with dates and times.

Records and Measurements

Maintain accurate records to support disease management and prevention decisions. Document the following information for each rabbit or group:

• Vaccination dates, product name, batch number, and administration route
• Quarantine periods and health observations
• Clinical signs observed, including date of onset and progression
• Body weight measurements taken at least weekly
• Feed and water intake estimates
• Treatments administered, including product, dose, route, and date
• Mortality events with dates and necropsy findings if performed

For commercial operations, record vector activity levels, weather conditions, and any changes in housing or management practices. These records support epidemiological analysis and help identify risk factors for outbreaks.

Outbreak Investigation Records

When a myxomatosis outbreak occurs, document the following:

• Date of first suspected case
• Number of rabbits affected and at risk
• Clinical signs observed in index case and subsequent cases
• Vaccination status of affected rabbits
• Recent introductions or movements of rabbits
• Vector activity levels before the outbreak
• Weather conditions in the preceding weeks
• Biosecurity measures in place at the time
• Treatments administered and outcomes
• Mortality and case fatality rates

Share this information with your veterinarian to support diagnostic efforts and regulatory reporting if required.

Common Failure Patterns

Several common errors undermine myxomatosis prevention and management efforts.

Incomplete Vaccination Protocols

Failure to complete the initial vaccination series or to administer annual boosters leaves rabbits susceptible. Some owners assume that a single vaccine dose provides lifelong protection. Review vaccination schedules with a veterinarian and maintain written records of all doses administered.

Delayed Recognition of Clinical Signs

Early signs of myxomatosis, such as mild eyelid swelling or a single skin nodule, may be overlooked. Owners sometimes attribute these signs to insect bites or minor injuries. Educate all personnel involved in rabbit care to recognize early clinical signs and report them immediately.

Inadequate Vector Control

Relying solely on vaccination without implementing vector control measures leaves a significant gap in protection. Even vaccinated rabbits can become infected if exposed to high viral loads from vector bites. Integrate vector control into the overall prevention program.

Poor Biosecurity During Outbreaks

When myxomatosis is suspected or confirmed, some operations fail to implement strict isolation and disinfection protocols. Movement of personnel, equipment, or animals between affected and unaffected areas spreads the virus. Develop and practice outbreak response protocols before an incident occurs.

Use of Ineffective Disinfectants

Not all disinfectants are effective against poxviruses. Some owners use household cleaners that lack virucidal activity. Verify that disinfectants used in rabbit housing are labeled as effective against enveloped viruses or poxviruses specifically.

Assuming Indoor Rabbits Are Safe

Indoor rabbits remain at risk from mosquitoes entering through open windows, doors, or ventilation systems. Vectors can also be carried indoors on clothing or equipment. Maintain vector control measures even for indoor rabbits, particularly during peak vector seasons.

Neglecting Quarantine Protocols

Skipping or shortening quarantine periods for new rabbits introduces disease risk. Some owners believe that rabbits from reputable sources do not require quarantine. Implement a minimum 14-day quarantine for all new rabbits regardless of source.

Welfare and Safety Context

Myxomatosis causes significant suffering in affected rabbits. The disease is characterized by progressive skin lesions, respiratory distress, and secondary infections that lead to prolonged illness and death. Prompt veterinary assessment is essential for welfare reasons.

Euthanasia Considerations

Rabbits with severe myxomatosis that do not respond to supportive care may require euthanasia on humane grounds. Criteria for euthanasia include:

• Inability to eat or drink independently for more than 24 hours
• Severe respiratory distress unresponsive to treatment
• Extensive skin ulceration with signs of pain
• Neurologic signs such as seizures or head tilt
• Rapid deterioration despite supportive care

Consult a veterinarian to assess quality of life and discuss euthanasia options. Euthanasia should be performed by a veterinarian using approved methods to ensure a humane death.

Public Health Considerations

Myxomatosis is not zoonotic. The myxoma virus does not infect humans, and there is no public health risk from handling infected rabbits. However, secondary bacterial infections in affected rabbits may include organisms that can cause disease in immunocompromised individuals. Practice standard hygiene when handling any sick animal.

Regulatory Reporting Requirements

Myxomatosis is a notifiable disease in some countries and regions. Check with local veterinary authorities to determine reporting requirements. In jurisdictions where reporting is mandatory, suspected or confirmed cases must be reported within specified timeframes. Failure to report can result in penalties and may impede disease control efforts.

Ethical Considerations for Commercial Operations

Commercial rabbit producers face difficult decisions when myxomatosis is confirmed. Depopulation of affected and exposed groups may be necessary to prevent further spread and reduce suffering. Consult with a veterinarian and local agricultural authorities to determine the most appropriate course of action. Maintain records of all decisions and actions taken during an outbreak.

Professional Escalation Criteria

Seek veterinary assistance in the following situations:

• Any rabbit showing signs consistent with myxomatosis, including eyelid swelling, skin nodules, or conjunctivitis
• Multiple rabbits in a group developing similar clinical signs
• Sudden death of one or more rabbits without obvious cause
• Rabbits that fail to respond to supportive care within 48 hours
• Rabbits with severe respiratory distress, anorexia, or dehydration
• Any rabbit requiring fluid therapy, pain management, or euthanasia
• When vaccination status is unknown or incomplete
• When outbreak investigation or regulatory reporting is required

Veterinarians can provide diagnostic confirmation, prescribe appropriate medications, administer fluid therapy, and advise on biosecurity measures. Do not attempt to treat suspected myxomatosis without veterinary guidance.

Diagnostic Confirmation Methods

Veterinarians may use several methods to confirm myxomatosis diagnosis:

• Polymerase chain reaction (PCR) testing on swabs from skin lesions or conjunctival discharge
• Virus isolation from tissue samples
• Histopathology of skin nodules or affected tissues
• Serology to detect antibodies in recovered rabbits

Sample collection and submission should follow laboratory guidelines. Discuss diagnostic options with your veterinarian based on clinical presentation and available testing facilities.

Decision Framework for Myxomatosis Risk Assessment and Response

A structured decision framework helps rabbit owners and managers evaluate myxomatosis risk, prioritize prevention measures, and respond appropriately when disease is suspected or confirmed. This framework integrates vaccination status, vector exposure, clinical findings, and biosecurity compliance into actionable categories that guide daily management and emergency response.

Risk Stratification Categories

Assign each rabbit or group to a risk category based on current conditions. Reassess risk at least weekly during vector activity seasons and immediately when any risk factor changes.

Clinical Decision Algorithm for Suspected Cases

When a rabbit shows signs consistent with myxomatosis, follow this step-by-step algorithm to determine the appropriate response.

Step 1: Initial Assessment

• Isolate the rabbit immediately from all other rabbits
• Record date, time, and all observed clinical signs
• Check vaccination records for the affected rabbit
• Note any recent vector exposure, new introductions, or known outbreaks
• Take photographs of lesions for veterinary reference

Step 2: Severity Scoring Assign a severity score based on clinical findings:

Total score interpretation:

• 1 to 3 points: Mild case, contact veterinarian within 24 hours, begin supportive care
• 4 to 6 points: Moderate case, contact veterinarian immediately, initiate intensive supportive care
• 7 or more points: Severe case, emergency veterinary consultation required, consider euthanasia

Step 3: Veterinary Contact Decision Contact a veterinarian if any of the following apply:

• Severity score is 4 or higher
• Rabbit is unvaccinated or vaccination status is unknown
• Multiple rabbits on the premises show similar signs
• Rabbit has not eaten or drunk for more than 12 hours
• Respiratory distress is present
• Rabbit is less than 8 weeks old or more than 5 years old
• Rabbit has a preexisting health condition

Step 4: Diagnostic Testing Decision Discuss with your veterinarian whether diagnostic testing is warranted. Testing is recommended when:

• Confirmation is needed for regulatory reporting
• Multiple rabbits are affected and cause is uncertain
• Vaccinated rabbits develop clinical signs
• The operation is commercial and disease status affects marketing or movement
• Differential diagnosis includes rabbit hemorrhagic disease or other notifiable conditions

Step 5: Treatment or Euthanasia Decision Based on veterinary assessment and severity score, decide on the treatment pathway:

• Mild cases with good prognosis: Intensive supportive care with daily monitoring
• Moderate cases: Veterinary-directed treatment including fluid therapy, pain management, and antibiotic therapy for secondary infections
• Severe cases with poor prognosis: Euthanasia to prevent suffering and reduce virus shedding
• Peracute cases with sudden death: Necropsy to confirm diagnosis and guide management of remaining rabbits

Outbreak Response Protocol

When myxomatosis is confirmed on your premises, implement this structured response protocol.

Phase 1: Immediate Response (First 24 Hours)

• Confirm diagnosis with veterinarian
• Isolate all affected rabbits in a separate building or area
• Stop all rabbit movements onto or off the premises
• Restrict personnel access to rabbit housing
• Set up footbaths with virucidal disinfectant at all entrances
• Designate separate clothing and equipment for affected and unaffected areas
• Notify all personnel of the outbreak and their responsibilities
• Contact regulatory authorities if reporting is required in your jurisdiction

Phase 2: Containment (Days 2 to 7)

• Conduct daily health checks on all rabbits, recording any new cases
• Cull severely affected rabbits on veterinary advice to reduce virus shedding
• Intensify vector control measures including insecticide application
• Clean and disinfect all surfaces in affected areas daily
• Remove and properly dispose of dead rabbits by incineration or deep burial
• Monitor unaffected rabbits for signs of disease
• Review biosecurity protocols and correct any deficiencies

Phase 3: Monitoring and Recovery (Days 8 to 30)

• Continue daily health monitoring of all rabbits
• Maintain strict isolation of affected and recovered rabbits
• Test recovered rabbits for persistent virus shedding if recommended by veterinarian
• Do not introduce new rabbits until at least 30 days after the last clinical case
• Conduct a thorough environmental decontamination before restocking
• Review the outbreak investigation records to identify contributing factors
• Adjust prevention protocols based on lessons learned

Phase 4: Return to Normal Operations

• Only resume normal operations after veterinary clearance
• Ensure all remaining rabbits are vaccinated or revaccinated
• Implement enhanced biosecurity measures permanently
• Maintain vector control programs year-round
• Continue regular health monitoring with increased vigilance
• Document all outbreak response actions for future reference

Record System for Risk Management

Maintain a structured record system to support risk assessment and response decisions. Use the following templates as a foundation for your record keeping.

Daily Risk Assessment Log

Weekly Health Monitoring Record

Outbreak Investigation Summary

Troubleshooting Common Decision Errors

Error 1: Delaying Veterinary Contact Some owners wait to see if clinical signs improve before contacting a veterinarian. This delay allows the disease to progress and increases the risk of spread to other rabbits. Contact a veterinarian at the first sign of eyelid swelling or skin nodules, especially in unvaccinated rabbits.

Error 2: Underestimating Vector Exposure Indoor rabbits are sometimes assumed to have no vector exposure. Mosquitoes enter through open windows, doors, and ventilation systems. Fleas can be brought indoors on clothing or other pets. Record any observed vectors indoors and adjust risk assessment accordingly.

Error 3: Incomplete Quarantine Implementation Quarantine is sometimes shortened or relaxed for rabbits from known sources. The incubation period for myxomatosis is up to 14 days, and infected rabbits may appear healthy during this period. Maintain full quarantine for the entire 14-day period regardless of the source.

Error 4: Inconsistent Biosecurity Compliance Biosecurity measures that are applied inconsistently provide a false sense of security. A single lapse, such as entering rabbit housing without changing footwear, can introduce the virus. Use a daily checklist to verify biosecurity compliance and address any gaps immediately.

Error 5: Misinterpreting Vaccination Protection Vaccination reduces disease severity but does not prevent infection or virus shedding. Vaccinated rabbits that become infected can still transmit the virus to other rabbits. Do not relax biosecurity measures for vaccinated rabbits, especially during outbreaks.

Error 6: Inadequate Environmental Decontamination After an outbreak, some owners clean housing but do not disinfect thoroughly. The myxoma virus persists in dried scabs and secretions for weeks to months. Use a virucidal disinfectant effective against poxviruses and allow adequate contact time as specified on the product label.

Error 7: Premature Restocking Introducing new rabbits too soon after an outbreak risks reinfection. Wait at least 30 days after the last clinical case and complete environmental decontamination before restocking. Test environmental surfaces for virus if testing is available in your area.

Practical Implementation Steps

To implement this decision framework on your farm or in your rabbitry, follow these steps:

1. Print the risk stratification table and post it in the rabbit housing area
2. Train all personnel on the clinical decision algorithm
3. Prepare a veterinary contact list with after-hours numbers
4. Set up a record system using the templates provided
5. Conduct a baseline risk assessment for your operation
6. Schedule weekly risk reassessments during vector activity seasons
7. Practice the outbreak response protocol with a drill
8. Review and update the framework annually or when conditions change

This decision framework provides a systematic approach to myxomatosis risk management that complements vaccination and biosecurity measures. Use it consistently to support timely and appropriate responses to changing disease risk.

Frequently Asked Questions

What causes myxomatosis in rabbits?

Myxomatosis is caused by the myxoma virus, a member of the poxvirus family. The virus is transmitted primarily through biting insects such as mosquitoes and fleas, but can also spread through direct contact with infected rabbits or contaminated objects. The disease was first described in South American rabbits and was intentionally introduced to European rabbit populations as a biological control measure. The Merck Veterinary Manual provides reference information on myxomatosis as a significant disease of rabbits.

How is myxomatosis transmitted between rabbits?

The myxoma virus is mechanically transmitted by blood-feeding arthropods including mosquitoes, fleas, and biting flies. These vectors acquire the virus when feeding on an infected rabbit and transmit it to susceptible rabbits during subsequent feedings. Direct contact with infected rabbits, their secretions, or contaminated bedding and equipment can also transmit the virus. The virus can survive in the environment for extended periods under favorable conditions.

What are the early signs of myxomatosis in rabbits?

Early signs of myxomatosis include swelling of the eyelids, ears, and genital region. Small skin nodules may appear at the site of virus entry, typically on the face or limbs. Affected rabbits develop conjunctivitis with clear or purulent ocular discharge. Nasal discharge, lethargy, and reduced appetite follow as the disease progresses. Some rabbits develop respiratory signs without prominent skin lesions.

Is there a vaccine for rabbit myxomatosis?

Vaccines are available in many countries where myxomatosis is endemic. Both monovalent myxomatosis vaccines and combined vaccines that also protect against rabbit hemorrhagic disease are produced. Vaccination reduces the severity of disease and mortality but does not provide complete protection against infection. Annual or semiannual boosters are typically required. Consult a veterinarian for vaccine availability and protocols in your area.

Can myxomatosis be treated in rabbits?

No specific antiviral treatment exists for myxomatosis. Supportive care focuses on maintaining hydration, nutrition, and comfort while the rabbit's immune system responds to the infection. Fluid therapy, nutritional support, wound care, and treatment of secondary bacterial infections can improve outcomes. Prognosis depends on the viral strain, host immunity, and quality of care. Severe cases may require euthanasia on humane grounds.

How long does myxomatosis last in rabbits?

The incubation period for myxomatosis is typically 5 to 14 days after exposure. Clinical disease progresses over 7 to 14 days in most cases. Rabbits that survive the acute phase may take several weeks to recover fully, with skin lesions resolving slowly. Mortality rates in unvaccinated domestic rabbits are high, with death often occurring within 10 to 14 days of clinical onset.

Can indoor rabbits get myxomatosis?

Indoor rabbits are at lower risk but can still contract myxomatosis. Mosquitoes and other biting insects can enter homes through open windows, doors, or ventilation openings. The virus can also be brought indoors on contaminated objects such as shoes, clothing, or equipment. Indoor rabbits that have no direct contact with wild rabbits or vectors remain at some risk, particularly during peak vector activity seasons.

Is myxomatosis contagious to humans or other pets?

Myxomatosis is not zoonotic and does not infect humans. The myxoma virus is specific to rabbits and does not cause disease in other companion animals such as dogs, cats, or guinea pigs. However, other pets can mechanically carry the virus on their fur or feet if they come into contact with infected rabbits or contaminated environments. Practice good hygiene when handling any animal that has been exposed to potentially infected rabbits.

Related Veterinary Guides

• Chinchilla Care
• Rabbit Preventive Care Wellness Exams
• Ferret Preventive Care Wellness Vaccinations Diet
• Sugar Glider Care
• Rabbit Dental Spurs

References and Further Reading

• www.merckvetmanual.com
• www.avma.org
• www.aemv.org
• Merck Veterinary Manual. Merck Veterinary Manual.
• Animal Health and Welfare. World Organisation for Animal Health.
• Myxomatosis.. Revue scientifique et technique (International Office of Epizootics), 2015.
• Myxomatosis and the rabbit.. The British veterinary journal, 1972.
• The establishment and spread of myxomatosis and its effect on rabbit populations.. Philosophical transactions of the Royal Society of London. Series B, Biological sciences, 1986.
• [Myxomatosis in the rabbit].. Schweizer Archiv fur Tierheilkunde, 2001.
• Myxomatosis and Rabbit Haemorrhagic Disease: A 30-Year Study of the Occurrence on Commercial Farms in Spain.. Animals : an open access journal from MDPI, 2019.
• Spatiotemporal monitoring of myxomatosis in European wild rabbit (Oryctolagus cuniculus) in Spanish Mediterranean ecosystems.. Transboundary and emerging diseases, 2022.
• Innate resistance to myxomatosis in wild rabbits in England. Journal of Hygiene, 1977.
• Also Belgian rabbits are affected by the rabbit hemorrhagic disease type 2 virus. Vlaams Diergeneeskundig Tijdschrift, 2016.
• A pathogenic myxoma virus in vaccinated and non-vaccinated commercial rabbits. Research in Veterinary Science, 2008.

This article is educational and is not a substitute for veterinary diagnosis or treatment. Contact a veterinarian for advice about an individual animal.