Gastrointestinal parasitism in giraffes (roundworms)
Gastrointestinal parasitism caused by roundworms (nematodes) is a very common disease in giraffes, whether they live in reserves, zoos, or their natural habitat. These small worms settle in the animal's stomach or intestines. They feed on...
What is it?
Gastrointestinal parasitism caused by roundworms (nematodes) is a very common disease in giraffes, whether they live in reserves, zoos, or their natural habitat.
These small worms settle in the animal's stomach or intestines. They feed on blood or digestive tissue and interfere with food absorption.
In young giraffes and weakened animals, infestation can become severe and lead to significant growth retardation or marked weight loss.
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:
Most infested giraffes show no visible signs, especially if the worm burden remains low.
When infestation becomes heavy, progressive weight loss may be seen despite maintained appetite, a dull and lackluster coat, decreased energy and alertness.
Soft stools or diarrhea can appear, sometimes accompanied by mild abdominal bloating.
In severe cases, particularly in young calves, growth retardation is observed, pale mucous membranes (resulting from blood loss caused by certain worms), and significantly decreased general condition.
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 several species of nematodes (roundworms) that parasitize the digestive tract, notably worms belonging to families similar to those found in cattle and antelopes (digestive strongyles).
Giraffes become infested by browsing foliage or grass contaminated with worm larvae present in the environment, which originate from feces of already-parasitized animals.
Young giraffes, stressed animals, sick animals, or those recently transported are more susceptible.
Close contact with other herbivores in the same enclosure, high stocking density, restricted grazing areas rarely rotated, and crowded conditions all favor the accumulation of infective larvae in the environment.
Warm and humid climatic conditions also promote larval development on soil and foliage.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
The veterinarian confirms the diagnosis by fecal analysis (coproscopy), which allows identification and counting of worm eggs.
In some cases, a blood test completes the assessment to evaluate possible anemia or protein loss.
Regular monitoring of body condition and growth in young animals also helps detect an infestation as it develops.
Treatment
Treatment is based on administration of appropriate antiparasitic medication (anthelmintics) chosen by the veterinarian based on test results and the species of worms identified.
Followup with a control fecal sample is often recommended to confirm treatment effectiveness.
In cases of severe anemia or dehydration, supportive care may be added.
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 strict management of enclosures and pastures: space rotation, regular manure removal, and avoiding overgrazing.
A regular parasite surveillance program, including periodic fecal samples, allows detection of infestations before clinical signs appear.
Good nutrition and stress management strengthen the animal's natural resistance to parasites.
Possible complications
Untreated infestation can lead to chronic weight loss, lasting growth delay in young animals, severe anemia, and general weakening that makes the animal more vulnerable to other diseases.
In extreme cases, particularly in young giraffes, massive infestation can be life-threatening.
When to see a veterinarian
Progressive weight loss with no apparent cause
Dull coat and loss of vitality
Persistent diarrhea or soft stools
Growth delay in a young animal
Pale mucous membranes or marked weakness
Prognosis
The prognosis is generally good when infestation is detected early and treated promptly.
Severe or neglected infestations, especially in young animals, may leave lasting effects on growth and require longer-term management.
Frequently asked questions
Is gastrointestinal parasitism in giraffes contagious to humans?
No, this disease is not transmissible to humans. The worms involved are specific to herbivores and pose no risk to caregivers or visitors.
How to tell if a giraffe is infested without visible signs?
Only a faecal analysis performed by a veterinarian can detect the presence of worm eggs, even in the absence of apparent symptoms.
Should all giraffes in a park be systematically dewormed?
The decision depends on the results of regular tests. A monitoring program makes it possible to target treatments rather than to worm systematically, which limits the risk of parasite resistance.
Are young giraffes at greater risk?
Yes, their immune system is still immature, which makes them more vulnerable to severe infestations and their impact on growth.
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 30 August 2026
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