Mycobacteriosis
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
Human-health precautions may applyFollow veterinary and public-health hygiene advice, especially for higher-risk household members.
Limit spread while seeking adviceSeparate affected animals when practical and obtain veterinary guidance on contacts, cleaning and normal mixing.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Mycobacteria can cause chronic granulomatous disease of skin, lungs, liver, spleen and other organs. Infection is difficult to eliminate and some species are zoonotic.
Mycobacteria cause chronic granulomatous infection of skin, lung, liver, spleen, bone or other tissues. Reptiles may develop slowly enlarging nodules, non-healing wounds, weight loss and organ enlargement, or show little until disease is disseminated. Environmental water and soil organisms can enter through wounds or compromised tissues, and poor husbandry or immune suppression may increase susceptibility. Routine bacterial antibiotics rarely cure established granulomas. Some nontuberculous mycobacteria are zoonotic, particularly through cuts or punctures, so diagnosis has implications for handlers and veterinary staff. Acid-fast organisms in a smear support suspicion but do not identify species or distinguish viable infection from contamination. Fungal granulomas, abscesses, gout and tumours can appear similar. The organism may be difficult to culture and can require specialised media and prolonged incubation.
Chronic wounds, contaminated environments, aquatic systems and immune compromise may contribute. Persistent nodules, non-healing ulcers, weight loss, respiratory disease and gradual decline may occur.
Granulomatous inflammation walls organisms within tissue but can also preserve infection for months while external signs remain modest. Lesions may rupture, seed new organs or recur after incomplete removal. Aquatic systems and chronic wounds provide repeated opportunities for entry, and repeated procedures create exposure opportunities for handlers. The combination of slow laboratory growth, variable drug susceptibility and potential zoonotic significance makes a small persistent nodule more consequential than its appearance suggests. Granulomas may rupture externally or seed additional organs, and stress from repeated surgery can worsen a patient already affected by chronic systemic disease. Long treatment courses also create substantial exposure opportunities for handlers cleaning wounds or aquatic systems. A chronic painless skin nodule can therefore represent a much broader disease process than its size suggests.
Screening & Early Detection
Obtain a biopsy from an active lesion for histopathology, acid-fast staining, mycobacterial culture and molecular identification, alerting the laboratory before submission. Avoid relying on a superficial swab. Image the coelom, lungs and skeleton to determine whether disease is local or disseminated, and establish blood baselines for organ function. Examine in-contact reptiles and audit water systems, wounds and equipment. Handlers should use gloves and cover skin breaks; people who develop persistent nodules after exposure should seek medical advice and report reptile contact.
Diagnosis requires biopsy, special stains, culture or molecular testing. Routine antibiotics may obscure but not cure disease.
Use cytology and biopsy with acid-fast staining, mycobacterial culture and molecular identification from deep tissue. Inform the laboratory before submission because special processing and prolonged incubation are required. Imaging and blood tests stage internal disease, while exposure history includes aquatic systems, wounds and immunocompromised household members. A negative superficial swab does not exclude a deep granuloma. Use gloves and protect skin wounds during examination while the organism and its human-health significance are being established.
Treatment & Management
Treatment is prolonged, uncertain and must consider human health and collection risk. Surgical removal may help isolated lesions. A solitary accessible granuloma may be completely excised and submitted for diagnosis. Disseminated disease requires prolonged multidrug therapy selected with specialist input, but evidence in reptiles is limited, adverse effects are important and microbiological cure may not be achievable. Never use a single empirical antibiotic for months, because resistance and false improvement can follow. Provide optimal temperature, nutrition and wound care and monitor liver and kidney function during any regimen. Isolate affected animals and dedicate equipment while zoonotic and collection risks are assessed. Where disease is widespread, recurrent or hazardous to a collection, euthanasia may be the most responsible option. Clean environmental reservoirs as far as practical, recognising that many nontuberculous species are widespread and complete eradication is difficult.
Complete surgical removal may control a solitary lesion, but disseminated infection responds poorly and prolonged multidrug therapy carries toxicity and resistance risks. Treatment is planned with reptile and infectious-disease expertise and includes culture information, organ monitoring and strict hygiene. Euthanasia may be the safest and most humane option when disease is widespread, recurrent or poses an unmanageable zoonotic or collection risk.
Disseminated disease has a poor prognosis.
Breeds or species affected
Central Bearded Dragon
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Eastern Bearded Dragon
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Eastern Water Dragon
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Frilled Lizard
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Eastern Blue-tongued Lizard
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Shingleback
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Pink-tongued Lizard
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Cunningham's Skink
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Ridge-tailed Monitor
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Storr's Monitor
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Black-tailed Monitor
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Children's Python
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Spotted Python
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Stimson's Python
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Carpet Python
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Centralian Carpet Python
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Woma Python
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Black-headed Python
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Green Python
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Smooth Knob-tailed Gecko
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Thick-tailed Gecko
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Beaded Gecko
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Marbled Velvet Gecko
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Eastern Snake-necked Turtle
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Broad-shelled Turtle
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