Sloth fungal dermatitis
Sloth fungal dermatitis is a skin infection caused by microscopic fungi. It mainly affects sloths kept in captivity, in care centers or animal parks, where hygiene and humidity conditions can favor the development of opportunistic fungi. Th...
What is it?
Sloth fungal dermatitis is a skin infection caused by microscopic fungi. It mainly affects sloths kept in captivity, in care centers or animal parks, where hygiene and humidity conditions can favor the development of opportunistic fungi. This condition remains rare but can be serious if not treated quickly, particularly in an animal already weakened by stress or an underlying illness.
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:
We observe areas of hairless skin, well defined, sometimes accompanied by scabs or peeling skin. The skin may appear red, thickened or blackened depending on how the infection progresses. The animal may scratch or lick more than usual on the affected areas. In advanced cases, an unusual odor may emanate from the skin and the animal may show signs of fatigue or loss of appetite if the infection affects its 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
Sloth fungal dermatitis is caused by opportunistic fungi, notably dermatophytes or yeasts, which take advantage of a weakening of the animal to develop on the skin. The three-toed sloth has a particular coat that naturally harbors algae and microorganisms; an imbalance in this skin ecosystem can promote the proliferation of pathogenic fungi. Stress, an unsuitable environment in captivity (excessive humidity, poor hygiene) or immunosuppression are common triggers.
The main risk factors are captivity with an environment that is too humid or poorly maintained, stress related to transport or handling, immunosuppression, a pre-existing skin wound, as well as contact with other animals or contaminated equipment.
Transmission
Transmission occurs through direct contact with an infected animal or indirectly via an environment, equipment or bedding contaminated with fungal spores. Some fungi can survive for a long time in the environment, making it easier for infection to persist in a poorly disinfected enclosure.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The exotic animal veterinarian first examines the animal's skin and coat. It looks for areas without hair, scabs or abnormally thickened skin. To confirm a fungal origin, he generally performs a skin scraping followed by a microscopic examination, supplemented if possible by culturing to identify the fungus in question. A Wood's lamp can sometimes help, but it does not detect all the responsible fungi. In some cases, a skin biopsy is suggested if the lesions are deep or do not respond to initial treatment.
Treatment
Treatment is mainly based on antifungals, applied locally in the form of creams or medicated shampoos, sometimes associated with systemic antifungal treatment in extensive forms. Regular cleaning of lesions and improvement of environmental hygiene conditions are an integral part of treatment. Antibiotic treatment may be added in the event of a secondary bacterial infection.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention is based on maintaining a clean and dry environment, with hygrometry appropriate to the species, avoiding excessive stagnant humidity. It is important to limit the animal's stress, ensure a balanced diet and carry out regular veterinary checks, particularly in captivity. Regular disinfection of enclosures and equipment limits the proliferation of fungi in the environment.
Possible complications
Without treatment, the lesions can spread to a large part of the body. A secondary bacterial infection can be added to already weakened skin. In a very weakened animal, the fungal infection can become generalized and be life-threatening.
When to see a veterinarian
Appearance of hairless areas or crusts on the skin.
The animal scratches or licks a particular area excessively.
The skin changes appearance (redness, thickening, darkening) or gives off an unusual odor.
Loss of appetite, depression or rapid worsening of skin lesions.
Transmission to humans
Certain fungi responsible for dermatitis in animals, such as certain dermatophytes, can occasionally infect humans, particularly people who are immunocompromised or in close and repeated contact with the animal. Hand hygiene after handling is recommended as a precaution.
Prognosis
The prognosis is generally favorable if the disease is detected and treated early. It becomes more reserved in a very weakened, elderly animal, or in cases of extensive infection and associated bacterial complications.
Frequently asked questions
Is sloth fungal dermatitis contagious to humans?
Certain fungi responsible for dermatitis in animals can occasionally be transmitted to humans by direct contact, especially in immunocompromised people. It is recommended to wash your hands after handling an affected animal and to consult a doctor in case of suspicious skin lesions.
Is the sloth's green fur linked to this disease?
No, the natural greenish color of the sloth's coat comes from symbiotic algae living in its hair, which is normal and different from a pathogenic fungal infection that causes lesions, scabs, and localized hair loss.
How long does the treatment last?
The duration varies depending on the severity of the lesions and the fungus involved. Antifungal treatment often lasts several weeks and must be continued until complete recovery is confirmed by the veterinarian, even if symptoms improve before then.
Can this disease be prevented in captivity?
Yes, by maintaining a clean environment, properly ventilated and with a humidity level appropriate to the species, while limiting sources of stress for the animal.
References
WSAVA — World Small Animal Veterinary Association
AVMA — American Veterinary Medical Association
Content reviewed by the TunisieVet editorial team · Updated 01 September 2026
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