Intestinal parasitism of the wall lizard (roundworms)

What is it?

Intestinal parasitism by roundworms (nematodes) is very common in wall lizards, both in terrariums and in the natural environment.\n

These small cylindrical worms live in the intestine of the reptile and feed partly at its expense.\n

In small quantities, they are often tolerated without visible signs. It's an imbalance — stress, overcrowding, insufficient hygiene — that tips you toward illness.\n

Commonly observed signs

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

Causes and risk factors

Several species of intestinal nematodes can colonize the digestive tract of the wall lizard, pinworms being among the most common.\n

These worms lay eggs passed in the stool. The animal recontaminates itself by ingesting these eggs present on the substrate, food or the walls of the terrarium, or by licking itself after contact with soiled stools.\n

Certain cycles also involve prey (insects) which play the role of intermediate host.

Life in captivity favors the accumulation of parasites because the eggs accumulate in a closed space, unlike the natural environment where the animal moves.\n

A poorly cleaned terrarium, too high a density of animals, a substrate soiled by excrement favor continuous reinfestation.\n

Stress, unsuitable temperature or humidity, poor diet weaken the lizard's natural defenses and encourage the multiplication of parasites.\n

Young animals and individuals recently captured from the wild or recently acquired are at greater risk.

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 an antiparasitic agent suitable for reptiles, prescribed and dosed by the veterinarian according to the weight and the species of parasite identified.\n

Nutritional support and rehydration may be necessary if weakened.\n

Complete cleaning of the terrarium and disinfection of the substrate are essential alongside treatment to avoid immediate reinfestation.\n

A follow-up stool test after treatment is often recommended to check effectiveness.

Prevention

Possible complications

A high untreated parasitic load can lead to severe malnutrition, dehydration, general weakening and, in extreme cases, death of the animal, especially in young or already weakened animals.\n

Intestinal obstruction due to accumulation of worms remains rare but possible in massive infestations.

When to see a veterinarian

Prognosis

The prognosis is generally good if treatment is early and associated with rigorous environmental sanitation.\n

Without treatment, progression can be slow but lead to progressive weakening, especially in young lizards or in the event of a heavy infestation.

Frequently asked questions

References

ESCCAP — European Scientific Counsel Companion Animal Parasites

Content reviewed by the TunisieVet editorial team · Updated 28 September 2026