Gastrointestinal parasitism of aye-aye (roundworms)
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the aye-aye, a nocturnal lemur native to Madagascar. These parasites live in the intestine of the animal and feed at its expense. They are mainly encountered in...
What is it?
Gastrointestinal parasitism by roundworms (nematodes) is a common condition in the aye-aye, a nocturnal lemur native to Madagascar. These parasites live in the intestine of the animal and feed at its expense. They are mainly encountered in animals living in captivity in zoos or conservation centers, but also in the wild. A light infestation often goes unnoticed, while a significant infestation can seriously weaken 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 depend on the number of parasites present. In a lightly infested aye-aye, we often see nothing at all.\n\nWhen the infestation becomes significant, we can observe a dull and less well-groomed coat, progressive weight loss despite a sometimes preserved appetite, soft or frankly liquid stools, sometimes with worms visible to the naked eye. The animal may appear more tired, less active, with a belly that appears swollen or bloated.\n\nIn a young animal, the infestation can stunt growth and make the coat duller than normal.
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 nematodes (roundworms) which settle in the intestine. Several species of roundworms can be involved in lemurs, including roundworms and pinworms adapted to these animals. These parasites lay eggs which are passed in the stools and contaminate the environment.
Young animals, weakened or stressed individuals, and those living in overcrowded or poorly maintained enclosures are at greater risk. A humid environment favors the survival of parasite eggs. The lack of regular veterinary monitoring and the absence of a deworming program also increase the risk of significant infestation.
Transmission
The aye-aye becomes contaminated by ingesting worm eggs present on food, ground, branches or objects soiled by feces. The cycle ends when the animal accidentally swallows these eggs while feeding or grooming itself. A poorly cleaned environment encourages the accumulation of eggs and continued reinfestation of animals.
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 examining a stool sample under a microscope, looking for roundworm eggs. This coprological examination can be repeated if the first result is negative but the clinical signs persist. A blood test can be useful to assess the general impact in a very emaciated or weakened animal.
Treatment
Treatment is based on the administration of a suitable antiparasitic agent, chosen and dosed by the veterinarian according to the type of worm identified. Supportive treatment (rehydration, appropriate nutritional intake) may be combined in weakened animals. Complete cleaning of the environment systematically accompanies the treatment to avoid immediate reinfestation.
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 the enclosure, with regular cleaning of the floors and rapid removal of excrement. Routine parasite control, including stool examination at regular intervals, can detect an infestation before it becomes severe. The quarantine of new arrivals and the removal of external sources of contamination (rodents, other animals) also help to limit the risks.
Possible complications
A massive, untreated infestation can lead to dehydration, severe weight loss and general weakening of the animal, making it more vulnerable to other diseases. In very young animals, lasting growth retardation is possible. In extreme cases, intestinal obstruction linked to a cluster of worms remains a rare but serious complication.
When to see a veterinarian
Presence of visible worms in the animal's stools.
Diarrhea or loose stools that persist for several days.
Visible weight loss or coat that becomes dull.
Decrease in activity, unusual fatigue or bloating of the stomach.
Any young aye-aye whose growth seems to be slowed down.
Prognosis
The prognosis is generally good when the infestation is detected early and treated by a veterinarian. Animals most often recover completely after treatment and improvement of environmental hygiene. The prognosis becomes more guarded in the event of a massive and prolonged infestation, especially in a young or already weakened animal.
Frequently asked questions
Can an aye-aye with roundworms transmit these parasites to humans?
Lemur gastrointestinal nematodes are generally specific to these animals and are not easily transmitted to humans. The risk is considered very low, but good hygiene is still recommended after handling.
How do I know if my aye-aye has worms without taking him to the vet?
There is no reliable way to know this without an exam. Many light infestations show no visible signs. Only a stool examination by a veterinarian can confirm the presence of parasites.
Should you deworm an aye-aye even if it shows no symptoms?
In conservation structures, regular parasite control with stool examination is recommended, even in the absence of symptoms, because a light infestation can go unnoticed while gradually weakening the animal.
How long does treatment for roundworms last?
The duration depends on the parasite involved and the severity of the infestation. It is the veterinarian who determines the duration and follow-up necessary, sometimes with a check of the stools after treatment to verify its effectiveness.
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 23 September 2026
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