Gastrointestinal parasitism of loris (roundworms)
Gastrointestinal parasitism caused by roundworms (nematodes) is a common condition among lorises, these small nocturnal primates native to Asia. These parasites live in the intestine of the animal and feed at its expense. Among lorises held...
What is it?
Gastrointestinal parasitism caused by roundworms (nematodes) is a common condition among lorises, these small nocturnal primates native to Asia. These parasites live in the intestine of the animal and feed at its expense. Among lorises held in captivity or survivors of animal trafficking, this parasitosis is particularly common due to stress and often precarious hygienic conditions. A light infestation may go unnoticed, but a heavy parasitic load seriously weakens the animal.
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 signs vary depending on the intensity of the infestation. A lightly parasitized loris may show no visible symptoms.\n\nIn case of more marked infestation, we observe diarrhea or loose stools, sometimes with the presence of worms visible to the naked eye. The animal loses its appetite, gradually loses weight and its coat becomes dull and less well-groomed.\n\nIn severe cases, belly bloating may appear, as well as general depression, dehydration and growth retardation in young individuals. The animal seems tired and less active than usual.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
Several types of roundworms (nematodes) can parasitize the digestive tract of the loris, including species close to those found in other primates. These parasites lay eggs passed in the stool, which then contaminate the environment, food or water.
Lorises recently captured in the wild, those resulting from illegal trade, or those living in conditions of overpopulation and insufficient hygiene are the most exposed. Stress linked to transport or a change in environment weakens natural defenses and encourages the multiplication of parasites. Insufficient cleaning of cages and repeated contact with excrement also increase the risk.
Transmission
Contamination occurs mainly orally, by ingesting eggs or larvae present in an environment soiled by infected stools, on food, bedding supports or branches. The cycle can be direct (without an intermediate host) for most of the nematodes concerned.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian makes the diagnosis by a microscopic examination of the stools (coproscopy), which makes it possible to identify parasite eggs. In some cases, several samples on different days are necessary because the release of eggs can be irregular. A complete clinical examination assesses the general condition of the animal, its hydration and its weight.
Treatment
Treatment is based on the administration of antiparasitics belonging to the family of broad-spectrum dewormers, specifically adapted to this fragile species. Additional nutritional support and rehydration may be necessary in weakened animals. Veterinary follow-up makes it possible to check the effectiveness of the treatment by checking the stools again.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Regular and rigorous cleaning of the enclosure greatly limits the risk of contamination. It is recommended to remove stools daily and disinfect surfaces.\n\nRegular veterinary check-ups with stool analysis can detect an infestation before serious symptoms appear. Quarantining new arrivals before integrating them into an existing group is also an important measure, especially in rescue centers or private collections.
Possible complications
A massive infestation left untreated can lead to intestinal obstruction, severe malnutrition, and general weakening that makes the animal more vulnerable to other infections. In young lorises, lasting growth retardation is possible.
When to see a veterinarian
Presence of persistent diarrhea or abnormal stools\nWorms visible in the stool\nUnexplained weight loss\nLong-lasting loss of appetite\nBloating or swelling of the stomach\nDull coat associated with general depression
Prognosis
The prognosis is generally good if the infestation is detected and treated early. It becomes more reserved in animals that are already weakened, young, or in cases of high parasitic load associated with malnutrition.
Frequently asked questions
Can loris parasitism be transmitted to humans?
The usual gastrointestinal loris nematodes are generally not considered transmissible to humans, but good hygiene after handling is still recommended.
How do I know if my loris has worms without taking him to the vet?
There is no reliable way to determine this at home. Only a stool analysis by a veterinarian can confirm a parasitic infestation.
Should you deworm a loris that shows no symptoms?
In animals at risk, particularly those recently acquired or rescued, preventive stool control is recommended even without visible symptoms.
Are roundworms dangerous for a young loris?
Yes, young people are more vulnerable and may develop stunted growth or greater weakening in the event of a significant infestation.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
ESCCAP — European Scientific Counsel Companion Animal Parasites
Content reviewed by the TunisieVet editorial team · Updated 23 September 2026
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