Infectious stomatitis in gharials (mouth rot)
Infectious stomatitis, often called mouth rot, is an infection of the oral mucosa affecting crocodilians, including gharials. It is marked by whitish to yellowish lesions, ulcers, and sometimes tissue necrosis in the mouth. This disease is...
What is it?
Infectious stomatitis, often called mouth rot, is an infection of the oral mucosa affecting crocodilians, including gharials. It is marked by whitish to yellowish lesions, ulcers, and sometimes tissue necrosis in the mouth. This disease is common in weakened or stressed animals, or those kept in poor husbandry conditions, both in captivity and in conservation facilities. Without treatment, the infection can spread and seriously compromise the animal's health.
Key point
This condition can become serious if it reaches the jawbone or progresses to septicemia; early treatment is advised.
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:
White-yellowish deposits or cheese-like plaques appear on the gums, palate, and inside the jaws. Ulcers and small wounds that fail to heal develop gradually. The animal may drool excessively, refuse to eat, and have foul-smelling breath. In advanced cases, swelling of the mouth or snout may be visible, sometimes extending to the jawbone. The animal becomes lethargic, less responsive, and may lose weight because it cannot feed properly.
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 most often bacterial, caused by opportunistic bacteria naturally present in the aquatic environment or the reptile's mouth. Fungi may sometimes be involved, particularly when the animal is already weakened. Infection typically takes hold through a pre-existing wound in the mouth, caused by a bite, rough handling, a foreign object, or trauma from feeding.
Significant stress, poor water or enclosure hygiene, unsuitable temperature or humidity levels promote the disease. Inadequate diet or nutritional deficiency can weaken the animal's immune defenses. Young gharials, recently captured or transferred animals, and those living in crowded groups are at higher risk. Repeated mouth injuries, such as those from handling or territorial fights, also increase risk.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
A reptile veterinarian examines the mouth cavity for characteristic lesions.
Samples from deposits or affected tissues allow bacterial and fungal analysis to identify the cause.
Additional tests, such as X-rays, may be recommended if jawbone involvement is suspected.
Treatment
Treatment typically involves repeated local cleaning of lesions and appropriate antiseptic solutions.
Antibiotics or antifungals given systemically may be prescribed by the veterinarian based on test results.
Improving housing conditions (water quality, temperature) is part of the overall management.
In severe cases, surgical debridement of dead tissue may be necessary.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Maintaining clean water with regularly monitored quality is essential.
A thermal environment suited to the species limits stress and supports immunity.
Avoiding overcrowding and minimizing stressful handling reduces the risk of mouth injuries.
A balanced diet appropriate for the animal's age helps prevent general decline.
Possible complications
Without treatment, infection can spread to deep tissue and the jawbone, causing osteomyelitis.
Septicemia, or system-wide spread of infection, is possible in serious cases.
The animal may also suffer severe malnutrition if unable to eat.
When to see a veterinarian
Persistent white or yellowish deposits in the mouth.
Refusal to eat for several days.
Visible swelling of the snout or jaw.
Excessive drooling or unusually strong breath odor.
Markable lethargy or behavioral changes.
Prognosis
The outlook is good when the disease is caught early and husbandry conditions are corrected. It becomes more guarded if bone involvement, septicaemia, or significant treatment delay occur.
Frequently asked questions
Is infectious stomatitis in gharials contagious to other animals?
It can spread between reptiles sharing the same tank if hygiene conditions are poor, but it is not considered transmissible to humans.
Can you treat this disease yourself?
No, a specialized veterinary opinion on reptiles is essential to identify the causative agent and adapt the treatment, cleaning alone being rarely sufficient.
How long does healing take?
The duration varies depending on the severity of the injuries and how quickly treatment is initiated; some mild cases improve within a few weeks, while others require longer-term follow-up.
How to prevent this disease in captivity?
Clean water, appropriate temperature, balanced nutrition, and stress reduction are the best preventive measures.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 30 October 2026
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