Gastrointestinal parasitism in saigas (roundworms)

What is it?

Gastrointestinal parasitism from roundworms (nematodes) is a very common disease in saigas, a wild antelope native to the steppes of Central Asia. Small worms settle in the stomach and intestines of the animal. They feed at the expense of the host and damage the digestive tract. This disease mainly affects young saigas and weakened animals, particularly when large herds gather on pastures. It is considered an important factor in mortality, especially when combined with other stressors such as food shortage or cold.

Commonly observed signs

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

Causes and risk factors

The disease is caused by several species of nematodes (roundworms) that parasitize the abomasum (the stomach) and intestine, notably from genera similar to those found in other wild antelopes and ruminants of the steppes. The eggs of these parasites are shed in feces, develop in the external environment, and are then ingested by saigas while grazing.

Young animals, pregnant or nursing females, and already weakened animals (malnutrition, cold exposure, other diseases) are the most vulnerable. Overcrowding on pastures, disrupted migrations, and droughts that concentrate herds around water sources significantly increase the risk of massive infection.

Transmission

Contamination occurs through the oral route, when grazing on grass or drinking water contaminated with larvae from the feces of infested animals. The cycle is favored by moisture and mild temperatures, and by the gathering of herds in restricted grazing areas.

Diagnosis and care

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

Treatment

Treatment, when possible in a wild or captive animal, relies on administering antiparasitic medications from the broad-spectrum dewormer family, under strict veterinary supervision. Supportive care (rehydration, nutritional supplementation) may be necessary for severely weakened animals.

Prevention

Possible complications

Massive infestation can cause anemia, severe dehydration, and general weakness that makes the animal more vulnerable to other infectious diseases and predators. In already fragile wild populations, this can contribute to episodes of significant mortality, particularly in young animals.

When to see a veterinarian

Prognosis

The prognosis depends largely on the severity of the infestation and the animal's overall condition. A light infestation in an otherwise healthy animal often resolves favorably, especially if environmental conditions improve. However, in young animals or those already weakened, the prognosis may be guarded, as this parasitic infection can contribute to significant mortality within wild populations.

Frequently asked questions

References

WOAH — Organisation mondiale de la santé animale (ex-OIE)

FAO — Organisation des Nations unies pour l'alimentation et l'agriculture

Content reviewed by the TunisieVet editorial team · Updated 06 September 2026