Platypus mycotic ulcer (mucormycosis ulcer disease)
Platypus mycotic ulcer is a skin disease caused by a microscopic fungus. It affects the platypus, a semi-aquatic mammal from Australia. This condition causes deep sores that do not heal easily, especially on the back, tail and legs. It has...
What is it?
Platypus mycotic ulcer is a skin disease caused by a microscopic fungus. It affects the platypus, a semi-aquatic mammal from Australia. This condition causes deep sores that do not heal easily, especially on the back, tail and legs. It has been particularly observed in Tasmania where it represents a threat to certain wild populations.
The disease often progresses slowly but can worsen in the event of stress, cold or weakening of the animal. It is not known to be transmitted to humans or other domestic animals.
Key point
Emerging disease of concern for the conservation of certain wild populations of platypus, particularly in Tasmania.
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 first signs are small skin lesions, often on the back, tail or base of the limbs. These sores gradually enlarge and form deep ulcers, sometimes covered with a crust or blackish tissue.
The animal may appear weakened, lose weight and become less active. Extensive lesions weaken the skin and can become secondarily infected by bacteria, worsening the general condition.
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 due to a fungal infection whose exact agent involved belongs to the group of fungi responsible for mucormycosis, capable of invading the skin and underlying tissues. The fungus generally takes advantage of skin that is already weakened, by an injury, a parasite or environmental stress, to settle in and develop.
Cold, prolonged humidity and variations in water temperature where the platypus lives seem to favor the appearance of lesions.
Cold and wet climatic conditions, particularly in Tasmania, are associated with a higher frequency of the disease. Animals that are weakened, injured or living in degraded waterways seem more vulnerable.
Reduced immunity, linked to other diseases or environmental stress, could also play a contributing role.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The diagnosis is based on the observation of typical skin lesions associated with samples taken by a veterinarian specializing in wildlife. Laboratory analysis, particularly by culture or microscopic examination of the fungus, can confirm the fungal infection and rule out other causes of skin lesions.
A skin biopsy may be necessary to assess the depth of the damage.
Treatment
Management is based on specialized veterinary care including cleaning and disinfection of wounds. Antifungal treatments can be used under strict veterinary supervision, as well as antibiotics in the event of a secondary bacterial infection.
Supportive care, such as a suitable diet and a calm environment, helps the animal recover.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
There are no specific prevention measures for wild platypuses. Preserving water quality and stream banks, as well as limiting human disturbance of natural habitats, contributes overall to the health of the species.
For animals in captivity or in care, rigorous hygiene of the aquatic environment and regular monitoring of the skin allow early detection of lesions.
Possible complications
Left untreated, ulcers can spread deeply, exposing underlying tissues and leading to serious secondary bacterial infections. General weakening can lead to severe weight loss and compromise the animal's survival, particularly in its natural environment where it must remain active to feed.
When to see a veterinarian
Discovery of an unusual sore or scab on the skin of an observed or captured platypus.
Visible weight loss or abnormally lethargic behavior of the animal.
A skin lesion that doesn't seem to heal or gets bigger over time.
Any platypus found weakened or in difficulty should be reported to the relevant wildlife authorities.
Prognosis
The prognosis depends on the early detection and extent of the lesions. Cases caught early, with specialized veterinary care, have a better chance of recovery. In the wild, the disease can represent a serious threat for affected individuals and, on a larger scale, for certain already weakened local populations.
Frequently asked questions
Can platypus mycotic ulcer be transmitted to humans or other animals?
No, this disease is not known to be transmissible to humans or pets. It remains specific to the platypus.
Where has this disease been mainly observed?
It has mainly been documented in Tasmania, Australia, in wild populations of platypus, particularly during cold and wet periods.
What should I do if I find a platypus with suspicious sores?
You should not handle the animal yourself. It is recommended to contact the relevant wildlife authorities in the area immediately.
Is this disease common?
It remains relatively rare but attracts particular attention from researchers because it can affect already vulnerable local populations of platypus.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
Content reviewed by the TunisieVet editorial team · Updated 02 September 2026
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