Infectious rhinitis in reptiles (herpesvirus infection)

What is it?

Infectious rhinitis in reptiles is inflammation of the nasal passages, most often caused by a viral infection including herpesviruses that have been suspected or identified in several reptile species. In the tuatara, a unique and protected animal native to New Zealand, infectious respiratory diseases remain uncommon but concerning because this species is endangered and often lives in isolated populations or in captivity for conservation purposes.

This fact sheet describes viral-origin infectious rhinitis as it may be seen in reptiles, applied to the tuatara by cautious extrapolation, as species-specific data remain limited in veterinary literature.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The primary suspected cause is viral, notably herpesviruses known in certain reptiles (tortoises, snakes, lizards). In the tuatara, the exact identification of the viral agent remains poorly documented to date.

Secondary bacterial co-infections may worsen the clinical picture once the respiratory passages have been weakened by the virus.

Stress, inadequate temperature or humidity, poor terrarium or enclosure ventilation, and close contact with other animals encourage the onset and spread of the disease.

An immunocompromised, young, elderly, or recently relocated animal (through transport or environmental change) is more vulnerable.

Since the tuatara is a species with slow metabolism and exceptional longevity, any chronic environmental stress can weaken its defenses over time.

Transmission

Transmission is believed to occur through direct contact between animals (nasal or ocular secretions) and possibly through contaminated materials (enclosures, substrates, handler hands). Strict quarantine of new animals is recommended before introducing them into an existing group.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

There is no validated specific antiviral treatment for this condition in tuatara. Management is primarily supportive: optimization of the environment (temperature, humidity), fluid therapy if needed, and treatment of secondary bacterial infections with an appropriate antibiotic class on veterinary prescription.

Local care to clear the nasal passages may be offered by the veterinarian.

Prevention

Possible complications

Secondary pneumonia can develop if the infection spreads to the lower respiratory tract.

Prolonged loss of appetite can lead to concerning general weakness in a species with slow metabolism.

In conservation collections, transmission to other individuals represents a major risk for the captive population.

When to see a veterinarian

Prognosis

The prognosis depends on how quickly treatment is started and the animal's overall health. Prompt management and an optimised environment support recovery. Cases with lower respiratory complications or in animals already weakened have a more guarded prognosis. Since the tuatara is a protected species with a low reproductive rate, each case warrants particular attention.

Frequently asked questions

References

WOAH — Organisation mondiale de la santé animale (ex-OIE)

Content reviewed by the TunisieVet editorial team · Updated 09 September 2026