Sarcoptic mange of the sloth bear
Sarcoptic mange is a skin disease caused by a tiny parasitic mite, Sarcoptes scabiei, which burrows into the surface layer of the skin. In the sloth bear (Melursus ursinus), a species native to the Indian subcontinent often present in zoolo...
What is it?
Sarcoptic mange is a skin disease caused by a tiny parasitic mite, Sarcoptes scabiei, which burrows into the surface layer of the skin. In the sloth bear (Melursus ursinus), a species native to the Indian subcontinent often present in zoological parks, this parasitosis causes significant discomfort and can worsen quickly if it is not treated. It also affects many other mammals, making it a disease to watch out for particularly in captivity or in contact with other animals.
Key point
Generalized and untreated sarcoptic mange can seriously compromise the welfare and health of the sloth bear, with a risk of significant general debilitation.
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 intense itching, pushing the animal to scratch, rub against walls or trunks, and sometimes to bite the skin.
We then observe localized hair loss which can spread, thick crusts, skin which reddens then thickens and wrinkles over time.
The skin may take on a grayish or blackened appearance in the most affected areas, with dandruff or scales that slough off.
The animal may appear tired, less active, and lose weight if the lesions are extensive or if a secondary infection sets in.
In advanced cases, wounds that do not heal may appear, leading to secondary bacterial infections.
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 caused by a microscopic mite, Sarcoptes scabiei, which settles in the superficial layers of the skin where the female digs tunnels to lay her eggs. The animal's inflammatory and allergic reaction to the presence of the parasite and its droppings is responsible for the itching and skin lesions.
A weakened immune system, chronic stress linked to captivity conditions, promiscuity with other carrier animals, as well as a degraded nutritional state favor the onset and severity of the disease. Young individuals and animals already weakened by another pathology seem more vulnerable.
Transmission
Transmission occurs mainly by direct contact between a parasitized animal and a healthy animal. It can also occur indirectly via a contaminated environment (bedding, enclosure, objects) over a short period of time, with the mite surviving only a short time outside its host. Close contact in captivity or when introducing new animals increases the risk of spread.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian carries out a clinical examination of the skin and confirms the diagnosis by a skin scraping examined under a microscope, allowing the mite, its eggs or its droppings to be visualized. Other additional tests, such as a skin biopsy, may be offered if the scraping remains negative despite suggestive signs.
Treatment
Treatment is based on external or systemic antiparasitics specific to scabies, prescribed and adapted by the veterinarian according to the species and condition of the animal. Additional skin care, as well as antibiotic treatment in the event of bacterial secondary infection, may be combined. Environmental treatment may also be recommended to limit the risk of recontamination.
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 good hygiene in enclosures, quarantine and systematic veterinary control of new arrivals, as well as regular monitoring of the condition of the skin and coat. Limiting contact with animals of unknown origin or uncertain health status reduces the risk of introducing the parasite. A clean environment and preventive veterinary monitoring help to limit the spread in animal communities.
Possible complications
If left untreated, skin damage can spread throughout the body, leading to marked thickening of the skin, dehydration and general weakening. Secondary bacterial infections can occur in injured areas, and in the most severe and prolonged cases, the animal's general condition can deteriorate significantly.
When to see a veterinarian
The animal scratches or rubs itself in an unusual and repeated manner.
Hairless areas or scabs appear on the skin.
The skin appears to thicken, wrinkle, or change color.
The animal shows a decrease in activity, appetite or loses weight.
Skin sores do not heal or appear to become infected.
Transmission to humans
Sarcoptes scabiei can occasionally be transmitted to humans through direct contact with an infested animal, causing transient itchy skin. This human form generally remains limited and often disappears without specific treatment once contact with the infested animal is interrupted, but medical advice is recommended in the event of skin lesions after contact with an affected animal.
Prognosis
The prognosis is favorable if the disease is detected and treated early, with gradual regrowth of the coat and healing of the skin. In the event of late diagnosis or very extensive lesions, healing takes longer and the prognosis remains guarded, especially if the animal is already weakened elsewhere.
Frequently asked questions
Is sloth bear sarcoptic mange contagious to humans?
The parasite can occasionally pass to humans through direct contact, causing temporary itching, but it does not settle permanently on human skin.
Can you treat a sloth bear with mange without a veterinarian?
No, a precise diagnosis and appropriate antiparasitic treatment, prescribed by a veterinarian, are essential to treat effectively and avoid complications.
Does sarcoptic mange permanently regrow the coat?
With early and appropriate treatment, the coat usually grows back, but complete healing may take several weeks depending on the extent of the lesions.
How to prevent the spread of mange between animals in captivity?
Quarantining new animals, regular skin monitoring and good enclosure hygiene can significantly limit the risk of transmission.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
CDC — Centers for Disease Control and Prevention
Content reviewed by the TunisieVet editorial team · Updated 22 September 2026
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