Pneumonia in the frilled lizard
Pneumonia is an inflammation of the lungs, most often of infectious origin. In the frilled lizard (Chlamydosaurus kingii), an arboreal reptile native to Australia and New Guinea, this disease affects the respiratory system and can quickly b...
What is it?
Pneumonia is an inflammation of the lungs, most often of infectious origin. In the frilled lizard (Chlamydosaurus kingii), an arboreal reptile native to Australia and New Guinea, this disease affects the respiratory system and can quickly become serious. \nAs with most reptiles, the signs are often discreet at first, which sometimes delays detection by the owner. \nRapid veterinary care clearly improves the prognosis.
Key point
Untreated pneumonia can quickly progress to life-threatening respiratory distress.
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:
The affected lizard breathes with difficulty, sometimes with open mouth, with unusual noises (whistling, clicking). \nWe often observe discharge from the nostrils or mouth, more abundant or foamy saliva. \nThe animal becomes less active, remains prostrate, refuses to feed and gradually loses weight. \nHe may also adopt an abnormal position, with his body straightened, to try to breathe better. \nIn advanced cases, a bluish or dull discoloration of the oral mucous membranes may appear, a sign of a lack of oxygen.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Pneumonia in the frilled lizard most often results from a bacterial infection, sometimes caused by or associated with viruses or respiratory parasites. \nOpportunistic bacteria, normally present in the environment or the respiratory tract, take advantage of a weakening of the animal to proliferate. \nPoor maintenance conditions, in particular unsuitable temperature or humidity, are very often the cause because they weaken the reptile's natural defenses.
The main risk factor is a poorly adjusted terrarium: too low temperature, lack of correct thermal gradient, excessive or insufficient humidity. \nChronic stress, an unbalanced diet, insufficient terrarium hygiene or inadequate ventilation also favor the appearance of the disease. \nAnimals that are young, old, or already weakened by another pathology are more vulnerable. \nA cold draft or sudden temperature variations can also trigger a respiratory episode.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian specializing in exotic animals examines the animal, listens to its breathing and assesses its general condition. \nAdditional examinations such as an x-ray, an endoscopy or samples from the respiratory tract often make it possible to identify the agent in question and the severity of the attack. \nA blood test can also help assess the animal's general condition.
Treatment
Treatment is generally based on antibiotic therapy adapted to the identified agent, associated with immediate correction of maintenance conditions (temperature, humidity). \nSupportive care, such as rehydration or nutritional assistance, may be necessary if the animal is no longer eating. \nIn certain cases, nebulization or oxygen therapy may be suggested by the veterinarian. \nNo treatment should be administered without veterinary advice, reptiles being particularly sensitive to dosage errors.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining a terrarium with a temperature and humidity appropriate for the species is the most important preventive measure. \nEnsuring good ventilation while avoiding cold drafts limits the risks. \nRegular cleaning of the habitat reduces the environmental microbial load. \nA varied and adapted diet supports the animal's natural defenses. \nLimiting sources of stress (excessive handling, unsuitable cohabitation) also helps to preserve the lizard's respiratory health.
Possible complications
Without treatment, pneumonia can progress to severe respiratory failure, septicemia (generalized infection) or the death of the animal. \nSignificant weight loss and general weakening often complicate recovery if diagnosis is late.
When to see a veterinarian
The lizard breathes with its mouth open or with visible effort.
Unusual breathing sounds are heard (whistling, clicking).
A discharge appears from the nostrils or mouth.
The animal has refused to eat for several days.
A marked weight loss or reduction is noted.
The oral mucous membranes appear pale, bluish or dull.
Prognosis
The prognosis is favorable if the disease is detected early and treated quickly, with correction of maintenance conditions. \nIn the event of delay in treatment or severe generalized infection, the prognosis becomes guarded, even serious.
Frequently asked questions
Is pneumonia contagious between reptiles?
Some infectious agents involved can be transmitted between reptiles, especially in the event of close contact or shared terrariums. It is prudent to isolate a sick animal and consult a veterinarian.
Can I treat my lizard myself with antibiotics?
No. Reptiles have a particular metabolism and self-medication can be dangerous or even fatal. Only a veterinarian can prescribe appropriate treatment.
How do you know if the temperature of the terrarium is the cause?
A check with a reliable thermometer and hygrometer allows you to check whether the parameters correspond to the needs of the species. A veterinarian or specialist can also advise on suitable settings.
How long does the healing take?
The duration varies depending on the severity of the infection and the speed of treatment. Some mild cases improve within a few weeks, others require longer follow-up.
References
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 28 September 2026
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