Gastrointestinal Parasitism in Asian Elephants (Roundworms)
Gastrointestinal parasitism caused by roundworms (nematodes) is a very common condition in Asian elephants, whether living in captivity or in the wild. These worms live in the stomach or intestines and feed at the animal's expense. In young...
What is it?
Gastrointestinal parasitism caused by roundworms (nematodes) is a very common condition in Asian elephants, whether living in captivity or in the wild. These worms live in the stomach or intestines and feed at the animal's expense. In young elephants especially, heavy infection can slow growth and weaken the animal's overall condition. Most adult elephants harbor a small number of parasites without showing any visible signs, but an imbalance—such as stress, poor nutrition, or high population density—can cause the situation to progress to disease.
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:
Signs depend on the number of worms present and the elephant's age.
Progressive weight loss is often seen despite preserved appetite, or alternatively there may be a noticeable decrease in appetite.
Stools may become soft or frankly diarrheal, sometimes with adult worms visible to the naked eye.
The coat (which is sparse and fine in elephants) and especially the skin appear dull and less supple.
The belly may appear swollen or tender on palpation, especially in younger animals.
A heavily infected elephant calf grows more poorly than its peers and appears stunted.
In severe infestations, the animal becomes depressed, lethargic, and loses weight noticeably.
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 condition is caused by several species of gastrointestinal nematodes specific to elephants, including strongyles (such as Murshidia and Quilonia) and ascarids (such as Amphistoma or species closely related to Ascaris). These worms lay eggs that are shed in the feces; after a period in the external environment, the larvae become infective and are swallowed by the elephant with grass, hay, or contaminated water.
Risk increases with overcrowding in enclosures or grazing areas, poor drainage and insufficient hygiene of soil contaminated with feces, warm and humid climate that favors larval survival, young age with less developed immunity, stress or unbalanced feeding, and lack of pasture rotation or manure management in captive elephant camps.
Transmission
Transmission occurs through the oral route: the elephant ingests infective larvae present on grass, hay, or in water contaminated by feces. There is no direct transmission between elephants without passage through the external environment.
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 laboratory examination of fecal samples (coproscopy), which detects and counts worm eggs. This test can be repeated to monitor progress after treatment.
A complete clinical examination (body condition, abdominal palpation, behavior observation) completes the diagnosis.
In some cases, blood work or abdominal ultrasound may be recommended to assess the overall impact on the animal's health.
Treatment
Treatment relies on giving broad-spectrum antiparasitic drugs under strict veterinary supervision, accounting for the elephant's large body weight and the risk of parasite resistance.
The choice of medication and treatment schedule are decided by the veterinarian based on fecal analysis results, never given routinely or empirically.
Nutritional support may be added if significant weight loss is present.
Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.
Prevention
Prevention depends on good environmental management: regular fecal collection, rotation of grazing or rest areas, preventing overcrowding, and ensuring clean water and food.
Regular fecal examinations (coproscopy) allow monitoring of infestation levels and deciding with the veterinarian the right time to treat.
Proper, balanced nutrition tailored to the elephant's needs strengthens its natural resistance to parasites.
Possible complications
Severe untreated infestation can cause lasting growth delay in young elephants, anemia, dehydration from chronic diarrhea, and general weakness that makes the animal more vulnerable to other diseases. In rare very severe cases, serious digestive complications may threaten the animal's life.
When to see a veterinarian
Diarrhea lasting more than a few days.
Visible worms in the feces.
Visible weight loss or refusal to eat.
Young elephant whose growth appears slower than other young animals in the group.
Unusual lethargy or abdominal tenderness to touch.
Prognosis
The outlook is generally good when infestation is detected early and treated under veterinary supervision, with complete recovery of the animal's general condition. The outlook becomes more guarded in young animals with heavy infestation or when treatment is delayed, as growth complications may persist.
Frequently asked questions
Are roundworms in elephants transmissible to humans?
No, gastrointestinal nematodes specific to elephants are not considered transmissible to humans. They are not known zoonotic parasites.
Should you deworm an elephant even if it shows no signs?
The decision is made with the veterinarian, generally based on regular faecal analysis rather than systematic treatment, in order to avoid parasitic resistance.
Can a healthy adult elephant harbor worms without being sick?
Yes, a low parasitic load is common and generally well tolerated by a healthy adult, with no visible impact on their health.
How can you tell if a baby elephant is infested?
A slowing of growth, diarrhea, or a sensitive belly should raise concern; only a fecal analysis by the veterinarian can confirm the diagnosis.
References
WOAH — Organisation mondiale de la santé animale (ex-OIE)
ESCCAP — European Scientific Counsel Companion Animal Parasites
FAO — Organisation des Nations unies pour l'alimentation et l'agriculture
Content reviewed by the TunisieVet editorial team · Updated 30 August 2026
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