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Reptile Center

Fungal Disease in Amphibians




Chytridiomycosis is a serious infectious disease caused by Batrachochytrium dendrobatidis, a zoosporic fungus related to water molds. The fungus feeds on keratin, a protein found in the outermost layers of the skin, and survives in most environments, even without a host. It is believed that the decrease in the population of frogs in many areas is due to chytridiomycosis.


A common way to recognize chytridiomycosis is to check your amphibian's skin for sloughing or shedding. The disease can be fatal for amphibians left untreated. Therefore, owners suspecting chytridiomycosis in their amphibian must seek immediate veterinary care.


Symptoms and Types


An amphibian suffering from chytridiomycosis may shed excessively, develop thickened or pale skin and, in the cases of tadpoles, disfigured beaks. Other common symptoms or signs include:


  • Lethargy
  • Loss of appetite (anorexia)
  • Constriction of the eye's pupil
  • Abnormal posture of the hind legs
  • Abnormal behavior and disposition
  • Hyperemia (an increase in blood flow to different body tissues)


Some amphibians present no clinical symptoms of the disease, but are still infected with the Batrachochytrium dendrobatidis fungus. These animals are carriers of the disease.




Chytridiomycosis is due to an infection with the B. dendrobatidis fungus. Generally, amphibians contract the fungus through their skin while in contaminated water.




Veterinarians diagnose the disease by examining skin scrapings or toe clips that are stained and put under a light microscope. Placing an infected animal in a shallow dish of water will often confirm the sloughing of skin, a common symptom for chytridiomycosis.


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