Mycoplasma Infection in Crested Geckos: Possible Respiratory and Systemic Disease

Mycoplasma refers to a group of very small bacteria that lack a normal cell wall. In veterinary medicine, these organisms are well known in several species, but in pet reptiles they are not among the most commonly confirmed causes of respiratory disease. In a crested gecko, a suspected mycoplasma infection usually means your vet is considering it as one possible bacterial contributor to pneumonia, upper airway inflammation, or a more widespread infection.

In practice, respiratory disease in reptiles is often multifactorial. Poor temperature gradients, low or excessive humidity, dehydration, stress, overcrowding, vitamin imbalance, and other infections can all weaken normal defenses and allow bacteria to take hold. That means a gecko may have signs consistent with a bacterial respiratory infection even when the exact organism is not confirmed.

Because reptiles often hide illness until they are quite sick, early signs can be subtle. A gecko that is sleeping more, eating less, or sitting low in the enclosure may be showing the first clues of a serious problem. If the infection becomes severe or prolonged, reptiles can develop pneumonia and even septicemia, which is a bloodstream infection.

Your vet can help sort out whether mycoplasma is likely, whether another infection is more probable, or whether husbandry problems are the main driver. The goal is not to guess the organism at home, but to recognize breathing changes early and get your gecko evaluated.

A confirmed mycoplasma infection would mean a Mycoplasma species is present and believed to be contributing to disease. In reptiles, though, respiratory infections are often linked to a combination of infectious and environmental factors. Your vet may look at mycoplasma alongside other bacteria, parasites, fungal disease, stomatitis, or pneumonia caused by mixed organisms.

Husbandry problems are a major risk factor. Reptile references consistently note that respiratory disease is more likely when temperatures are outside the species' preferred range, sanitation is poor, humidity is not appropriate, nutrition is unbalanced, or the animal is stressed. For crested geckos, repeated chilling, poor ventilation, chronic dampness without airflow, and dehydration can all make normal airway defenses less effective.

Spread between reptiles is also possible with infectious respiratory disease, especially when new animals are introduced without quarantine. Shared tools, hands, feeder cups, and enclosure furnishings can move organisms from one reptile to another. A gecko that already has another illness or is under chronic stress may be more likely to become clinically sick after exposure.

Because the same signs can happen with several diseases, it is safest to think of mycoplasma as one possibility rather than the only explanation. Your vet will use the history, exam, and testing plan to decide whether infection, husbandry, or both are driving the problem.

Diagnosis starts with a careful history and physical exam. Your vet will usually ask about enclosure temperatures, humidity, ventilation, recent shedding, diet, supplements, cleaning routine, and any new reptiles in the home. In reptiles, husbandry details are often a key part of the diagnosis because environmental problems can either mimic infection or make infection much worse.

If respiratory disease is suspected, your vet may recommend imaging such as radiographs to look for changes in the lungs and airways. Depending on the gecko's size and stability, additional testing may include oral or choanal swabs, cytology, bacterial culture, PCR testing, fecal testing, or sample collection from the respiratory tract. These tests help your vet look for bacteria, parasites, inflammatory cells, and other causes of pneumonia.

Mycoplasma can be harder to confirm than some routine bacteria because it does not behave like typical cell-walled organisms. That means your vet may discuss specialized testing or may treat based on the overall clinical picture when a gecko is too unstable to wait. In some cases, the diagnosis remains "suspected bacterial respiratory infection" rather than a fully confirmed mycoplasma case.

Bloodwork is not always possible or necessary in every gecko, but it may be considered in advanced cases, especially if your vet is worried about dehydration, organ effects, or septicemia. The most useful diagnostic plan depends on your gecko's condition, your vet's findings, and what information would change treatment decisions.

Prevention starts with strong day-to-day husbandry. Reptile veterinary references consistently emphasize that respiratory disease becomes more likely when enclosure temperatures are inappropriate, sanitation is poor, nutrition is unbalanced, or the animal is stressed. For crested geckos, that means maintaining a species-appropriate temperature gradient, avoiding repeated chilling or overheating, providing appropriate humidity with good airflow, and keeping the enclosure clean and dry between misting cycles rather than constantly wet.

Quarantine new reptiles before introducing them to the same room, tools, or routines. A separate enclosure, separate feeding and cleaning supplies, and handwashing between animals can reduce spread of infectious disease. If one reptile in the home develops respiratory signs, it is wise to isolate that animal and contact your vet before symptoms appear in others.

Routine observation matters more than many pet parents realize. Track appetite, body weight, shedding, stool quality, and nighttime activity. Small changes often show up before severe breathing distress does. Early veterinary care gives your gecko more treatment options and may reduce the chance that a localized airway problem becomes pneumonia.

Regular wellness visits with your vet can also help catch husbandry issues before they lead to illness. If you are unsure whether your enclosure setup is supporting respiratory health, bring photos, temperature readings, and humidity logs to the appointment so your vet can help you fine-tune the environment.