Pentastomiasis in Lizards: Lungworm-Like Tongue Worm Infection

Pentastomiasis is a parasitic infection caused by pentastomes, sometimes called tongue worms. Despite the name, they are not true worms. In reptiles, these parasites most often affect the respiratory tract, especially the lungs and airways, which is why they can look like a lungworm-type problem.

Some infected lizards show no obvious signs, especially early on. Others develop irritation and inflammation where the parasites attach. In more serious cases, the airway can become partly blocked, making breathing harder and reducing normal activity, appetite, and body condition.

This condition is seen more often in reptiles with exposure to wild-caught prey, feeder animals, or contaminated environments. It can also be found during quarantine screening or routine fecal testing. Because reptiles often hide illness well, subtle changes in breathing, appetite, or weight deserve attention from your vet.

Pentastomes in reptiles also matter for household hygiene. Reptiles can carry organisms that affect people, and careful hand washing and enclosure sanitation are important whenever you handle your lizard, its feces, feeder items, or habitat equipment.

Pentastomiasis happens when a lizard becomes infected with pentastome parasites during the parasite life cycle. Reptiles may become infected by eating infected intermediate or transport hosts, such as insects, small vertebrates, or other prey items carrying larval stages. Wild-caught feeders increase that risk.

In captive settings, exposure is more likely when lizards are fed wild-caught prey, housed with infected reptiles, or kept in enclosures contaminated with parasite eggs. Pentastome eggs are hardy in the environment, so poor sanitation can allow ongoing exposure.

Wild-caught reptiles are at higher risk than captive-bred animals because they have had more chances to encounter infected prey and contaminated habitats. Newly acquired lizards can also bring parasites into an established collection if quarantine is skipped.

Husbandry does not directly cause pentastomiasis, but stress, crowding, and suboptimal temperatures can make it harder for a lizard to cope with infection. Good quarantine, feeder sourcing, and enclosure hygiene all help lower risk.

Your vet will start with a full history and physical exam, including questions about prey type, feeder source, recent additions to the collection, weight changes, and breathing signs. Because reptiles often have more than one problem at once, your vet may also review temperatures, humidity, lighting, and diet.

Diagnosis often begins with fecal testing. Pentastome eggs may be found on microscopic fecal examination, but parasite shedding can be intermittent, so one negative test does not completely rule the infection out. Your vet may recommend repeat fecal exams on multiple fresh samples if suspicion remains high.

If your lizard has respiratory signs, your vet may also suggest radiographs, bloodwork, or other tests to look for complications and rule out other causes of breathing trouble. In some cases, more advanced diagnostics such as endoscopy, airway sampling, or direct visualization are needed to confirm where parasites are located and whether removal is possible.

A confirmed diagnosis matters because treatment choices are not one-size-fits-all. Drug therapy for pentastomes is not consistently reliable, and in some reptiles, removing visible parasites may be safer than trying medication alone. Your vet will match the plan to your lizard’s species, symptoms, and overall stability.

Prevention focuses on breaking the parasite life cycle. Feed captive-bred prey and feeder insects whenever possible, and avoid wild-caught prey. For collections that use frozen prey items, safe sourcing and handling matter. Good feeder hygiene also helps reduce other reptile health risks.

Quarantine any new reptile before introducing it to your established group. During quarantine, schedule an exam with your vet and discuss fecal screening. Routine reptile visits often include fecal testing, and your vet may also recommend bloodwork or radiographs depending on the species and history.

Keep enclosures clean and remove feces promptly. Pentastome eggs can be resilient in the environment, so thorough cleaning and disinfection of surfaces, bowls, hides, and tools is important. Do not share enclosure equipment between reptiles without cleaning it first.

Protect people as well as pets. Wash your hands well after handling your lizard, its habitat, feeder items, or waste. Keep reptile cleaning supplies out of food-preparation areas, and ask your vet for extra precautions if anyone in the household is very young, elderly, pregnant, or immunocompromised.