Hookworm and Strongyle Infections in Crested Geckos

Hookworms and strongyles are intestinal nematodes, or parasitic worms, that can live in the digestive tract of reptiles. In lizards, these parasites may damage the intestinal lining, interfere with normal digestion, and increase fluid and nutrient loss. PetMD lists hookworms among the common intestinal worms seen in reptiles, and Merck notes that reptile parasite treatment decisions depend on both the organism found and the reptile's overall condition.

In a crested gecko, a low parasite burden may cause few obvious signs at first. Problems are more likely when the parasite load is high, the gecko is young, recently acquired, stressed, underweight, or living in suboptimal conditions. That is why one gecko may test positive on a fecal exam and still look fairly normal, while another becomes weak, thin, and dehydrated.

The term strongyle is broad and refers to a group of nematodes with similar egg types on fecal testing. In practice, your vet may use this term when eggs are seen under the microscope but the exact worm species is not fully identified. For pet parents, the key point is that these are treatable intestinal parasites, but treatment should be guided by an experienced reptile vet rather than by over-the-counter deworming products.

Most crested geckos become infected by swallowing infective eggs or larvae from a contaminated environment, feeder insects, enclosure items, or feces. PetMD notes that captive reptiles can pick up intestinal worms through contact with infected reptiles, contaminated objects and habitats, or infected food items. In mixed collections, parasites can spread quickly if quarantine and sanitation are inconsistent.

New arrivals are a common source. A gecko may look healthy while still shedding parasite eggs. Shared tools, decor, feeding cups, and hands moving between enclosures can all help spread infection. Feeder insects raised or stored in unsanitary conditions may also play a role.

Stress and husbandry problems do not directly create hookworms, but they can make infection more likely to cause illness. Overcrowding, poor enclosure hygiene, chronic dampness with fecal buildup, incorrect temperature gradients, and inadequate nutrition can all weaken a gecko's resilience. Merck and VCA both emphasize that parasite findings in reptiles must be interpreted in the context of species, environment, and overall health.

Diagnosis usually starts with a history, physical exam, weight check, and fecal testing. VCA notes that microscopic examination of reptile feces can detect intestinal parasites, including worms, and also points out that not every positive fecal result automatically requires treatment. Your vet will look at the whole picture: appetite, body condition, hydration, stool quality, recent purchases, feeder sources, and enclosure hygiene.

The most common test is a fresh fecal exam, often using direct smear and fecal flotation. Merck describes direct smear as the simplest and least expensive fecal test, while flotation helps detect helminth eggs and some protozoal stages. Because reptiles may shed parasites intermittently, a single negative test does not always rule infection out. Your vet may recommend repeat samples if suspicion remains high.

If your gecko is very ill, your vet may also suggest additional testing such as bloodwork, radiographs, or parasite identification through a diagnostic lab. These tests help rule out other causes of weight loss and weakness, including husbandry-related disease, bacterial infection, protozoal disease, or reproductive issues. Follow-up fecal testing after treatment is important to confirm that the parasite burden has dropped and to decide whether another treatment round is needed.

Prevention starts with quarantine and fecal screening. New reptiles should be housed separately from established pets until your vet has examined them and checked a fecal sample. AVMA reptile care guidance encourages an initial wellness exam, and VCA notes that fecal testing is a routine part of reptile preventive care.

Good sanitation matters every day. Remove feces promptly, clean feeding surfaces, avoid sharing tools between enclosures without disinfection, and keep feeder insects from contacting waste. If one reptile in a collection has intestinal parasites, assume the environment may also be contaminated until proven otherwise.

Supportive husbandry also lowers risk. Keep temperatures, humidity, nutrition, and enclosure setup appropriate for crested geckos so the immune system and digestive tract are not under extra stress. A gecko in a clean, species-appropriate enclosure is better able to tolerate minor exposures and less likely to spiral into clinical disease.

Finally, schedule routine checkups with your vet, especially for newly acquired geckos, breeding animals, juveniles, or any reptile with recurring stool changes. Regular weight tracking and periodic fecal exams can catch problems before your gecko becomes visibly ill.