Kea papilloma (psittacine papillomatous disease)
Psittacine papillomatous disease is a viral condition that affects certain parrots, including the kea (Nestor notabilis), a parrot endemic to New Zealand. It causes the appearance of small growths called papillomas, most often in the cloaca...
What is it?
Psittacine papillomatous disease is a viral condition that affects certain parrots, including the kea (Nestor notabilis), a parrot endemic to New Zealand. It causes the appearance of small growths called papillomas, most often in the cloaca, beak or digestive tract. In the kea, this disease is documented particularly in captive populations and attracts particular attention because the species is threatened and already fragile.
Key point
In the kea, an endangered species with limited numbers, this disease is subject to particular monitoring in captivity and in conservation programs, due to the risk of serious long-term internal complications.
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:
Papillomas most often appear around the cloaca: they are small irregular masses, sometimes pinkish or whitish in color, which can bleed slightly on contact.
They can also develop in the beak, crop, esophagus or intestine, making the bird more discreet in its symptoms.
Depending on the location, we may observe difficulty swallowing, regurgitation, abnormal stools, progressive weight loss or decreased appetite.
A carrier bird may also show no visible signs for a long time, with the disease progressing silently.
In some cases, chronic papillomas of the digestive tract are associated with the subsequent appearance of internal tumors, especially in the liver or pancreas, which worsens the prognosis.
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 an avian papillomavirus (Papillomaviridae family). Different papillomaviruses have been identified in psittacines, with possible variations depending on the bird species affected.
Living in groups or in collective aviaries favors transmission between birds.
Stress, a weakened immune system or poor breeding conditions can promote the clinical expression of the disease in a bird carrying the virus.
Young birds and closed captive populations seem particularly affected.
Transmission
The virus is probably transmitted by direct contact between birds, as well as through contaminated surfaces or objects (feeders, perches, breeding equipment). Transmission from mother to young during chick rearing is also suspected.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The avian veterinarian examines the bird and observes any visible lesions, especially around the cloaca.
A sample (biopsy) of the suspicious mass allows a laboratory analysis to confirm that it is indeed a papilloma and rule out other causes of the mass.
Additional examinations (endoscopy, imaging) may be offered if internal damage to the digestive tract is suspected.
Treatment
The main treatment for visible and accessible papillomas is surgical removal of the mass.
Depending on the case, other local approaches to destroying the lesion may be considered by the veterinarian.
There is no specific antiviral treatment to eliminate the virus itself.
Nutritional support may be offered if the bird is having difficulty eating due to the lesions.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
There is no vaccine against this disease in psittacines.
Prevention is based on good aviary hygiene, regular disinfection of equipment and surfaces, and quarantine of new birds before their introduction into a group.
Limiting stress and maintaining good breeding conditions helps reduce the risk of clinical appearance of the disease in a carrier bird.
Possible complications
Papillomas may enlarge, interfere with eating or bleed.
A chronic progression of digestive lesions has been associated with the appearance of internal tumors, particularly hepatic or pancreatic, in certain affected psittacines.
Recurrences after surgical removal are possible, the virus often persists in the body.
When to see a veterinarian
The bird has a visible mass or growth near the cloaca
Bleeding, even slight, is observed in the cloaca
The bird eats less or loses weight for no apparent reason
Regurgitation or difficulty swallowing appears
General behavior changes (dejection, isolation)
Prognosis
The prognosis depends on the location and extent of the lesions.
Isolated cloacal papillomas, surgically removed, often have a favorable short-term outcome, even if recurrences remain possible.
Internal digestive forms or those associated with secondary tumors have a more guarded prognosis.
Regular veterinary follow-up is important to monitor the appearance of new lesions.
Frequently asked questions
Is kea papilloma contagious to other birds?
Yes, the virus responsible can be transmitted between birds, in particular by direct contact or via shared equipment. It is recommended to isolate an affected bird and thoroughly disinfect its environment.
Does this disease affect humans?
No, avian papillomaviruses are specific to birds and are not transmitted to humans.
Should a kea carrying the virus always be operated on?
Not necessarily. Some carrier birds never develop a visible lesion. The decision to intervene depends on the size, location and discomfort caused by the papilloma, to be assessed with an avian veterinarian.
Can a kea be permanently cured of this disease?
Surgical removal of a visible papilloma is possible, but the virus can persist in the body and cause recurrences. There is no treatment to completely eliminate the virus.
References
AVMA — American Veterinary Medical Association
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 05 September 2026
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