Reptile Emerging Infectious Diseases                                                                                Articles  About  Report
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Photo taken in Ohio showing signs of fungal infection on the belly scales of a northern water snake, causing the scales to thicken and form blisters (Credit: USGS National Wildlife Health Center photo by  D.E. Green)
01  Snake Fungal Disease

Snake fungal disease (SFD), also known as ophidiomycosis, is a fungal disease that has notably affected wild and captive snakes. The fungal pathogen Ophidiomyces ophiodiicola causes this disease, which typically presents as abnormalities of the skin such as discoloration, ulcerative lesions, and swelling. These localized skin conditions can lead to more chronic conditions, which may cause morphological and sensory impairment, as well as alterations in behavior and physiology, which commonly increase mortality. The level of concern regarding snake fungal disease is significant as it poses a threat to wildlife conservation, given its wide geographic range and the possibility that environmental changes could alter host susceptibility. There is no cure for SFD. While captive snakes may respond to antifungal treatments and environmental management, treating wild populations remains highly challenging.  


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Found in:
North America
Europe
Asia
Australia



The photo shows a large python showing signs of inclusion body disease, including opisthotonus, where there is hyperextension of the neck and back. Image reproduced with permission from Douglas R. Mader, originally published in Reptiles Magazine, 2014. Used with permission.  
02    Inclusion Body Disease
 
Inclusion body disease (IBD) is a progressive viral disease that affects snakes of various species, primarily boas and pythons. The causative agent is reptarenaviruses, and IBD is characterized by the presence of cytoplasmic inclusion bodies found in blood smears and tissue samples. Symptoms include neurological signs, regurgitation, lymphoproliferative disorder, or increased susceptibility to secondary infections. There is no known treatment for IBD. It is often described as fatal, which suggests euthanization is the best solution once the disease has progressed. Until recently, IBD had only been observed in captive snakes, but its presence in wild snakes posed a threat to wildlife conservation.


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Found in:
North America
Europe
Asia

Australia
Brazil
Costa Rica






The photo shows a reticulated python with its mouth wide open, which could be the behavior “gaping,” yawning, or serve as a defense. If this behavior is shown for an extended period followed by excessive mucus or respiratory sounds, it could be an indicator of ferlavirus infection. Photo by Nirmal Kumar on Unsplash.      
03  Ferlavirus Infection

Ferlavirus infection is a serious, potentially fatal disease that primarily affects snakes. The virus, which belongs to the genus Ferlavirus, is the causative agent. While it does not cause specific infection-related symptoms, it is often recognized for the damage it causes to the respiratory and neurological systems. Significant knowledge gaps remain regarding the treatment and transmission of this disease. It occurs worldwide and can cross-infect multiple reptile species, posing challenges for both conservation efforts and disease management.


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Found in:
United States
Europe
Asia

Costa Rica
Brazil