Lungworm Infection in Lemurs: Respiratory Parasites to Watch For

Lungworm infection is a respiratory parasite problem caused by nematodes that live in the airways, lung tissue, or nearby blood vessels. In animals, these parasites can trigger inflammation of the lower respiratory tract, sometimes described as verminous bronchitis or verminous pneumonia. The result is irritation, coughing, and in heavier infections, real trouble moving air.

In lemurs, published species-specific guidance is limited, so your vet will often adapt what is known from other mammals, nonhuman primates, and exotic animal medicine. That means the exact parasite may not always be identified right away, but the clinical approach is still familiar: stabilize breathing first, then look for evidence of larvae, eggs, or lung changes on testing.

Some lungworms use snails or slugs as intermediate hosts, while others may spread through contaminated environments or secretions depending on the parasite involved. A reported lemur case in the veterinary literature involved Angiostrongylus (Parastrongylus) cantonensis, a rat lungworm with a life cycle linked to gastropods. Because different parasites behave differently, confirming the cause matters for both treatment planning and prevention.

For pet parents, the key point is that any new cough or breathing change in a lemur deserves attention. Respiratory disease in exotic species can worsen quickly, and early care often gives your vet more options.

Lungworm infection starts when a lemur is exposed to infective parasite stages in the environment. For some lungworms, the life cycle includes snails or slugs as intermediate hosts. Other small animals such as rodents, birds, reptiles, or amphibians may act as transport hosts for certain species. If a lemur has access to outdoor enclosures, wild prey, contaminated browse, or areas visited by rats or gastropods, exposure risk can increase.

In mammals, larvae may be swallowed and then migrate through the body to the lungs, or they may mature in ways that eventually place eggs or larvae in the respiratory tract. Those larvae are often coughed up, swallowed, and passed in feces, which is why stool testing can help diagnose a lung infection. The body’s inflammatory response to the parasites is what causes many of the clinical signs.

A published report of a red ruffed lemur in Louisiana linked disease to rat lungworm, Angiostrongylus (Parastrongylus) cantonensis. That parasite normally cycles between rats and snails or slugs, but abnormal hosts can become infected after ingesting infective larvae. In those abnormal hosts, disease may involve the nervous system as well as the lungs, so your vet may widen the workup if a lemur has both respiratory and neurologic changes.

Not every coughing lemur has lungworm. Bacterial pneumonia, fungal disease, aspiration, heart disease, airway irritation, and other parasites can look similar. That is why your vet will usually focus on both confirming parasites and ruling out other causes at the same time.

Diagnosis usually starts with a careful history and physical exam, including listening to the chest and reviewing any exposure to outdoor habitats, snails, slugs, rodents, or wild-caught food items. Because respiratory signs are not specific, your vet may recommend chest radiographs to look for patterns consistent with bronchitis, nodules, or pneumonia.

Fecal testing is a key part of the workup. A routine fecal flotation may find eggs for some parasites, but many lungworms are better detected with a Baermann test because it is designed to recover larvae from stool. In practice, your vet may ask for fresh fecal samples collected over more than one day, since parasite shedding can be intermittent.

If the diagnosis is still unclear, additional testing may include CBC and chemistry testing, pulse oximetry, airway sampling such as transtracheal wash or bronchoalveolar lavage, and sometimes bronchoscopy. These tests can help identify larvae directly, document inflammation, or look for secondary infection. In unstable patients, your vet may stabilize breathing with oxygen before pursuing more advanced diagnostics.

Because lemurs are exotic mammals with limited species-specific reference data, diagnosis often relies on pattern recognition and a stepwise plan rather than one single test. That approach is normal. It helps your vet match the workup to your lemur’s stress tolerance, breathing status, and your goals for care.

Prevention focuses on limiting exposure to the parasite life cycle. For many lungworms, that means reducing contact with snails, slugs, and wild rodents. Outdoor or mixed indoor-outdoor enclosures should be checked regularly for gastropods, standing water, rodent activity, and contamination of food or browse. Wild-caught plants, produce, or enrichment items should be cleaned carefully before use.

Good enclosure hygiene matters. Prompt feces removal, clean feeding areas, and secure food storage can lower the chance of environmental contamination and rodent attraction. If your lemur lives in a facility with multiple animals, your vet may recommend routine fecal screening, especially when any animal develops coughing or unexplained weight loss.

Avoid offering prey items or foraged materials unless your veterinary team has approved the sourcing and handling plan. Because some parasites use transport hosts, exposure is not limited to snails and slugs alone. Your vet may also advise quarantine and screening for newly introduced animals.

There is no one-size-fits-all preventive medication plan for lemurs. The safest approach is to work with your vet on a species-appropriate parasite control strategy based on housing, geography, and known local risks. If your lemur has had prior respiratory disease, ask whether periodic monitoring would be helpful.