Aye-aye herpesvirus
Aye-aye herpesvirus is a rare viral infection described in this nocturnal primate from Madagascar (Daubentonia madagascariensis), both in the wild and in captivity in some zoological parks. It is caused by a virus in the Herpesviridae famil...
What is it?
Aye-aye herpesvirus is a rare viral infection described in this nocturnal primate from Madagascar (Daubentonia madagascariensis), both in the wild and in captivity in some zoological parks. It is caused by a virus in the Herpesviridae family, a family known to cause similar diseases in other primates. The information available on this disease remains limited because the aye-aye is a poorly studied and endangered species, and documented cases are rare. The veterinarian specializing in exotic animals or wildlife medicine is best placed to guide the diagnosis and treatment.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
Signs reported in primates with herpesvirus disease include fever, general depression, and loss of appetite. Skin lesions or crusts may appear, sometimes accompanied by discharge from the eyes or nose. In the most severe forms, damage to the nervous system can manifest as convulsions or behavioral disorders. The severity of symptoms varies greatly depending on the animal's immune status and the viral strain involved.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by a herpes virus, an agent capable of remaining latent (hidden) in the body after an initial infection, then reactivating during periods of stress or reduced immune defenses. In primates, several different herpesviruses exist, some being species specific and others capable of transmission between closely related species.
Stress, captivity, promiscuity with other primates, a weakened immune system and young age are considered factors that can favor the appearance or reactivation of the disease.
Transmission
Transmission occurs mainly by direct contact with infected secretions (saliva, discharge) or by respiratory route during close contact between individuals. Contact with other species of primates carrying a herpesvirus could represent a risk, particularly in captivity.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
Diagnosis is based on clinical examination associated with specialized laboratory analyses, such as the search for the virus by PCR on samples of lesions or secretions. These examinations can only be carried out in laboratories specializing in wildlife pathology.
Treatment
Management may include specific antivirals, supportive treatments to maintain hydration and general condition, and local care for skin lesions. The therapeutic choice must always be decided by a veterinarian competent in primate or exotic wildlife medicine.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is mainly based on biosecurity measures in captivity: limiting contact between different species of primates, quarantine for any new animals, rigorous hygiene of enclosures and reduction of stress. There is no vaccine available for this disease in the aye-aye.
Possible complications
Severe neurological damage, pneumonia or a general worsening of health can occur in severe forms, particularly in an already weakened animal.
When to see a veterinarian
The animal has a fever or unusual depression.
Skin lesions, crusts or discharge appear on the face.
The animal has refused to eat for more than a day.
Tremors, convulsions or behavioral disturbances are observed.
Prognosis
The prognosis strongly depends on the precocity of treatment and the immune state of the animal. Mild forms can progress favorably with appropriate care, while forms with neurological damage remain more worrying, particularly in a species as rare and fragile as the aye-aye.
Frequently asked questions
Can aye-aye herpesvirus be transmitted to humans?
There is no documented evidence of transmission of this specific virus to humans, but any handling of a sick animal must be done with caution and strict hygiene.
Is there a vaccine to protect the aye-aye against this disease?
No, no vaccine is currently available for this disease in the aye-aye.
Is this disease common in aye-aye?
Documented cases remain rare, in part because the aye-aye is an understudied and endangered species, with limited populations observed closely.
Can an aye-aye in captivity be protected from this disease?
Biosecurity measures like quarantining new animals and limiting contact with other primates help reduce the risk.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 23 September 2026
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