Intestinal parasitism of skinks (roundworms)

What is it?

Intestinal parasitism by roundworms (nematodes) is very common in skinks, particularly the sand skink (Scincus scincus). These small burrowing lizards live in close contact with the sand and substrates of their terrarium, which favors the life cycle of many digestive parasites. Most skinks harbor a certain number of worms without showing clinical signs, but an imbalance (stress, poor breeding conditions, immunosuppression) can tip a subtle infestation into a severe parasitic disease.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Causes and risk factors

The roundworms involved mainly belong to several families of intestinal nematodes common in reptiles, notably pinworms (Pinworms, very common and often not very pathogenic in low numbers) and roundworms or digestive strongyles (potentially more pathogenic). These parasites lay eggs passed in the stool, which contaminate the substrate, water and food. The skink reinfests itself by ingesting these eggs or by consuming prey (insects) which themselves carry infective larvae.

The risk increases in captivity when the hygiene of the terrarium is insufficient, with the substrate rarely changed or cleaned. A high density of animals in the same enclosure favors transmission. Stress linked to unsuitable temperature or humidity weakens the skink's natural defenses. Newly acquired or recently imported animals, not dewormed and not quarantined, represent a frequent source of introduction of parasites. Young skinks and already weakened animals are more susceptible to severe infestation.

Transmission

Transmission is mainly by the fecal-oral route: ingestion of worm eggs present in the substrate, water or food soiled by contaminated feces. Consumption of prey (insects) carrying infective larvae is another possible route of contamination. Direct contact between infested skinks in the same terrarium also promotes propagation.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

Treatment

Treatment is based on the administration of specific antiparasitic drugs suitable for reptiles, prescribed and dosed only by a veterinarian competent in exotic animals, because many common antiparasitic molecules are toxic to reptiles if used incorrectly. Supportive treatment (rehydration, assisted feeding) may be necessary in advanced cases. A coproscopic check after treatment is recommended to check the effectiveness and the absence of recurrence.

Prevention

Possible complications

A massive infestation left untreated can lead to intestinal obstruction, severe nutrient malabsorption, extreme weight loss and general weakening conducive to other opportunistic infections. Intestinal or cloacal prolapse can occur in the event of repeated defecation efforts, requiring emergency surgical treatment. In young animals, permanent growth retardation is possible.

When to see a veterinarian

Prognosis

The prognosis is generally favorable if the infestation is detected early and treated by a reptile veterinarian. In the absence of treatment, or in the event of a very high parasite load in an already weakened animal, the progression can be severe, particularly in young skinks or immunocompromised animals.

Frequently asked questions

References

ESCCAP — European Scientific Counsel Companion Animal Parasites

Content reviewed by the TunisieVet editorial team · Updated 27 September 2026