Gastrointestinal parasitism in jacanas (roundworms)

What is it?

Gastrointestinal parasitism caused by roundworms (nematodes) is a common condition in water birds such as the wattled jacana. These parasites live in the bird's intestines and feed at its expense. In jacanas kept in captivity or living in heavily frequented wetland areas, infestation can become significant if the environment is not properly managed. A light parasitic load often goes unnoticed, but heavy infestation can seriously weaken the bird, particularly young birds.

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 roundworms (nematodes) can parasitize wading birds and water birds, notably ascarids and capillaries. These worms lay eggs that are shed in droppings, which contaminate the surrounding water and vegetation. Other birds or the same individual then become infested by ingesting these eggs or aquatic invertebrates (intermediate hosts) carrying larvae.

Young jacanas are more vulnerable because their immune defenses are still immature. High bird density at the same water source, a poorly maintained pond or enclosure, stagnant water that is seldom renewed, and stress from captivity increase the risk of infestation. Pre-existing weakness from other illness or poor nutrition also promotes a higher parasite burden.

Transmission

Contamination occurs mainly through ingestion of worm eggs present in water, mud or vegetation soiled by droppings from infested birds. Some parasites also pass through an intermediate host, such as small aquatic invertebrates consumed by the jacana while feeding at the surface of floating plants.

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 administering an antiparasitic medication suitable for birds, prescribed and dosed exclusively by a veterinarian specializing in avian or exotic animal medicine. Nutritional support may be added to help the bird recover. Follow-up often includes a fecal check after treatment to confirm its effectiveness.

Prevention

Possible complications

Severe untreated infestation can lead to anemia, severe weight loss, and general weakness that makes the bird more vulnerable to other infections. In young birds, this can compromise growth permanently. In extreme cases, intestinal blockage from a mass of worms is possible, though rare.

When to see a veterinarian

Prognosis

The outlook is generally good when infestation is caught early and treated by a veterinarian experienced with exotic birds. Severe cases, particularly in young birds or those already weakened, require careful management and close monitoring.

Frequently asked questions

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 08 September 2026