Gastrointestinal Parasites in Asian Elephants: Interpreting Faecal Findings

A positive faecal examination confirms the detection of parasite stages in the sample. It does not, by itself, establish that the elephant has clinically significant parasitic disease. 

That distinction is important because gastrointestinal parasites are detected in both free-ranging and captive Asian elephants, and exposure can vary with environment, season and management. 

Start with what the faecal result actually shows 

In South Wayanad, Kerala, parasites were detected in 74.5% of 55 elephant dung samples. Strongyloides and strongyle-type eggs were the most frequently detected, while mixed infections were also recorded^[1]. 

The study also found considerable variation in eggs per gram (EPG) between samples, demonstrating that a positive result does not represent the same level of parasitic burden in every elephant^[1]. 

This makes the first clinical question more useful than simply asking whether the sample is positive: 

What parasite was detected, and how much evidence is there of infection? 

Consider burden alongside detection 

Where quantitative examination is available, EPG or another validated quantitative measure can add useful information to a positive/negative result. 

The South Wayanad study found parasite loads ranging from 128.6 to 1,757.1 EPG, with substantial variation between samples^[1]. More recent work in captive Asian elephants in central Nepal also found that the detection rate varied according to the diagnostic method used, with flotation identifying more positive samples than some other techniques^[2]. 

This has a practical implication: a negative result from one examination method should not necessarily be interpreted as definitive exclusion of parasitism, particularly when clinical suspicion remains high. 

The sampling method, laboratory technique and timing of examination therefore matter when interpreting a faecal result. 

The elephant’s clinical status changes the significance 

The same laboratory finding can have different clinical relevance in different animals. 

Greater attention is warranted when parasite detection occurs alongside: 

• Weight or body-condition loss; 
• Persistent diarrhoea or altered faecal output; 
• Reduced appetite; 
• Lethargy or reduced activity; 
• Anaemia or other haematological abnormalities; 
• Repeated or increasing parasite burden; 
• Evidence of poor nutritional status. 

In a 2021 study of 31 captive Asian elephants in Kerala, gastrointestinal parasites were detected in 32.2% of the animals, with strongyle ova predominating. The infected group also showed differences in haematological parameters, including anaemia and eosinophilia^[3]. 

These findings should not be interpreted as diagnostic markers of parasitism. They are clinical context that may increase the relevance of a faecal finding when considered alongside the history and examination. 

Look for repeated exposure 

A single positive sample does not explain whether exposure is transient or persistent. 

Indian studies have demonstrated that parasite detection can vary with season, host characteristics and management system. In captive elephants in Tamil Nadu, parasite prevalence differed between management systems and across seasons^[4]. 

This makes repeated surveillance particularly useful where elephants have continuing exposure to potentially contaminated environments. 

The objective is not simply to build a list of parasites detected over time. 

It is to identify whether there is a persistent pattern of exposure, recurrent detection or increasing burden that corresponds with clinical findings or management conditions. 

Mixed infections deserve attention 

More than one parasite may be detected in the same elephant. 

The South Wayanad study documented mixed infections involving Strongyloides, strongyle-type eggs and Ancylostoma, among others^[1]. A 2025 study of captive Asian elephants in central Nepal similarly reported a broad range of protozoan and helminth parasites, with mixed infections occurring commonly^[2]. 

These findings reinforce why a faecal report should be interpreted as a parasitological profile, rather than focusing on a single organism in isolation. 

At the same time, detection of multiple parasite types does not automatically mean that every detected organism is contributing to clinical disease. 

Let the result inform management, not replace clinical judgement 

When a clinically relevant parasitic infection is suspected, interpretation should take into account: 

• Parasite identification; 
• Quantitative burden where available; 
• Clinical signs; 
• Body condition; 
• Previous faecal results; 
• Previous antiparasitic treatment; 
• Likelihood of reinfection; 
• Season and environmental exposure; 
• Sanitation and management practices. 

A positive result should therefore not automatically lead to repeated empirical treatment without considering whether the detected parasite is clinically relevant and whether the underlying exposure is likely to persist. 

Where treatment is undertaken, follow-up faecal examination can help determine whether the expected parasitological response has occurred and whether recurrent exposure may be contributing to subsequent detection. 

Clinical takeaway 

A faecal examination is most useful when detection is interpreted alongside parasite burden, clinical status, previous findings and exposure conditions. 

A positive result is a finding—not a diagnosis of clinically significant parasitic disease. 

For elephants managed in India, the more useful question is therefore not simply “Is the faecal sample positive?”, but: 

“What was detected, how much was detected, is the elephant clinically affected, and is the exposure likely to continue?”

References:

1. Abhijith TV, Ashokkumar M, Dencin RT, George C. Gastrointestinal parasites of Asian elephants (Elephas maximus L. 1798) in south Wayanad forest division, Kerala, India. J Parasit Dis. 2018;42(3):382-390. https://doi.org/10.1007/s12639-018-1012-0
2. Vanitha V, Thiyagesan K, Baskaran N. Prevalence of intestinal parasites among captive Asian elephants (Elephas maximus): effect of season, host demography and management systems in Tamil Nadu, India. J Threat Taxa. 2010;2:1527–1534. https://doi.org/10.11609/JoTT.o2488.1527-34
3. Punya, M.S., Shyma, V.H., Reshnu, V.C, Vijayakumar, K., Vinodkumar, K., Ambily, R. and Arun Zachariah. 2021. Gastrointestinal parasites of captive Asian elephants in Kerala. J. Vet. Anim. Sci. 52(3): 312-315. https://doi.org/10.51966/jvas.2021.52.3.312-315
4. Vidya TN, Sukumar R. The effect of some ecological factors on the intestinal parasite loads of the Asian elephant (Elephas maximus) in southern India. J Biosci. 2002 Sep;27(5):521-8. https://doi.org/10.1007/bf02705050