a small population of rattlesnakes（响尾蛇） that already is in decline in southern illinois faces a new and unexpected threat in the form of a 1 rarely seen in the wild, researchers report. 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 2 and wildlife veterinarian matthew allender, who led the health 3. long-term population studies of the snake -- in illinois and elsewhere -- had never turned up evidence of 4 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（使变丑） lesions on their heads. the snakes died within three weeks of their discovery. a fourth snake with a similar 5 was discovered in the same park in the spring of 2010.
allender conducted necropsies（验尸） on the snakes and identified the pathogen that had killed them: c hrysosporium, a fungus that plagues portions of the pet 6（爬行动物） 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（木材） rattlesnakes in new hampshire and massachusetts," allender said. although biologists have 7 identified chrysosporium in those snakes, the symptoms they report -- facial 8 and 9 and malformations of the 10 -- are the same, he said. these infections also occurred only within the last five years.
"fungal pathogens（病原体） have been increasingly associated with free-ranging 11 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 12 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."
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