Strategic Communications and Marketing News Bureau

Rare fungus kills endangered rattlesnakes in southern Illinois

CHAMPAIGN, lll. – A small population of rattlesnakes that already is in decline in southern Illinois faces a new and unexpected threat in the form of a fungus rarely seen in the wild, researchers report.

University of Illinois comparative biosciences visiting instructor Matthew Allender has discovered that Chrysosporium, a fungus not normally seen in free-living wildlife, is killing eastern massasauga rattlesnakes in southern Illinois.

University of Illinois comparative biosciences visiting instructor Matthew Allender has discovered that Chrysosporium, a fungus not normally seen in free-living wildlife, is killing eastern massasauga rattlesnakes in southern Illinois.

The eastern massasauga rattlesnake (Sistrurus catenatus catenatus), a candidate for protection under the federal Endangered Species Act, suffers from habitat loss and environmental stresses wherever it is found, said University of Illinois comparative biosciences visiting instructor and wildlife veterinarian Matthew Allender, who led the health investigation. Long-term population studies of the snake – in Illinois and elsewhere – had never turned up evidence of debilitating fungal infections. But in 2008, biologists studying the snake reported to Allender that they had found three sick snakes in a park in southern Illinois, all with disfiguring lesions on their heads. The snakes died within three weeks of their discovery. A fourth snake with a similar syndrome was discovered in the same park in the spring of 2010.

Allender conducted necropsies on the snakes and identified the pathogen that had killed them: Chrysosporium, a fungus that plagues portions of the pet reptile industry but is not normally seen in the wild, he said.

Chrysosporium causes disease in bearded dragons and in other snakes and it’s a bad bug,” Allender said. “We see it in captive animals worldwide, but we don’t typically find it in free-ranging animals.”

Chrysosporium also is emerging as a dangerous infection in humans with weakened immune systems, he said.

Shortly after he first presented his findings at a meeting of the Fish and Wildlife Service, Allender heard from other biologists about similar infections in snakes in the northeast United States.

“They seem to be having a similar problem in timber rattlesnakes in New Hampshire and Massachusetts,” Allender said. Although biologists have sporadically identified Chrysosporium in those snakes, the symptoms they report – facial swelling and ulcers and malformations of the jaw – are the same, he said. These infections also occurred only within the last five years.

“Fungal pathogens have been increasingly associated with free-ranging epidemics in wildlife, including the well-known effects of Batrachochytrium dendrobatidis on frog populations globally and white-nosed syndrome in bats,” Allender wrote in a December 2011 report in Emerging Infectious Diseases. “Both of these diseases cause widespread and ongoing deaths in these populations that seriously threaten biodiversity across the United States.”

Allender sees this new occurrence of a fungal infection in endangered snakes as a “yellow flag” that warrants more study.

“Wildlife diseases and human health are not that different,” he said. “And often wildlife are our window into a weakened environment that leads to disease in both people and animals.”

Editor’s note: To contact Matthew Allender, call 217-265-0320; email mcallend@illinois.edu.

The paper, “Chrysosporium sp. Infection in Eastern Massasauga Rattlesnakes,” is available online.

Read Next

Health and medicine Dr. Timothy Fan, left, sits in a consulting room with the pet owner. Between them stands the dog, who is looking off toward Fan.

How are veterinarians advancing cancer research in dogs, people?

CHAMPAIGN, Ill. — People are beginning to realize that dogs share a lot more with humans than just their homes and habits. Some spontaneously occurring cancers in dogs are genetically very similar to those in people and respond to treatment in similar ways. This means inventive new treatments in dogs, when effective, may also be […]

Honors From left, individuals awarded the 2025 Campus Awards for Excellence in Public Engagement are Antoinette Burton, director of the Humanities Research Institute; Ariana Mizan, undergraduate student in strategy, innovation and entrepreneurship; Lee Ragsdale, the reentry resource program director for the Education Justice Project; and Ananya Yammanuru, a graduate student in computer science. Photos provided.

Awards recognize excellence in public engagement

The 2025 Campus Awards for Excellence in Public Engagement were recently awarded to faculty, staff and community members who address critical societal issues.

Uncategorized Portrait of the researchers standing outside in front of a grove of trees.

Study links influenza A viral infection to microbiome, brain gene expression changes

CHAMPAIGN, Ill. — In a study of newborn piglets, infection with influenza A was associated with disruptions in the piglets’ nasal and gut microbiomes and with potentially detrimental changes in gene activity in the hippocampus, a brain structure that plays a central role in learning and memory. Maternal vaccination against the virus during pregnancy appeared […]

Strategic Communications and Marketing News Bureau

507 E. Green St
MC-426
Champaign, IL 61820

Email: stratcom@illinois.edu

Phone (217) 333-5010