Why It Matters
Oregon has joined the growing list of states battling white-nose syndrome, a deadly fungal disease that has decimated bat populations across North America and pushed at least one species toward extinction. The detection of the disease in Oregon bats marks a critical threshold for the state’s wildlife management efforts and carries implications for ecosystem health, agricultural pest control, and cave recreation. Bats provide essential ecological services, consuming tons of insects nightly, including agricultural pests that would otherwise require chemical pesticides. The arrival of white-nose syndrome in Oregon represents both an immediate conservation challenge and a test of the state’s capacity to slow the disease’s spread through caves and natural habitats.
What Happened
Oregon state wildlife officials announced on Wednesday that scientists from the National Wildlife Health Center identified six bats infected with white-nose syndrome in Columbia and Benton counties during March 2026. This marks the first confirmed detection of the disease in Oregon bats, though the fungus itself had been identified in bat guano collected from a roost in Clatsop County in 2025.
The detection triggered a coordinated response among state and federal agencies. Scientists from Oregon Department of Fish and Wildlife and the National Wildlife Health Center will conduct ongoing monitoring to identify additional sites where bats may be infected. The effort includes collaboration with wildlife rehabilitators and the Oregon Veterinary Disease Laboratory at Oregon State University to provide care for affected animals.
White-nose syndrome attacks the skin of hibernating bats, creating scarring and holes in their wings as the infection spreads. The disease forces bats to wake during hibernation and venture into cold temperatures searching for food. This metabolic disruption exhausts the fat reserves necessary for survival through winter, ultimately leading to starvation or freezing.
By the Numbers
- Nearly 7 million bats have been killed by white-nose syndrome nationwide since the disease emerged approximately 20 years ago
- The fungus has been detected in 38 states as of 2026
- Oregon was one of approximately a dozen states that had remained unaffected until this year
- Six bats in Columbia and Benton counties tested positive for the disease in March 2026
- The northern long-eared bat became the first bat species federally listed as endangered due to white-nose syndrome in 2022
Zoom Out
White-nose syndrome emerged in New York around 2006 and has since become one of the most significant wildlife disease threats in North America. The fungus, Pseudogymnoascus destructans, spread to Washington state by 2016 and has steadily advanced across the country. Oregon’s infection marks the continued westward expansion of the pathogen and suggests that few remaining regions remain unaffected.
The disease spreads primarily through direct bat-to-bat contact within caves and hibernacula. However, human activity accelerates transmission. Contaminated clothing, equipment, and footwear transported between caves can carry fungal spores to previously uninfected sites. This human-mediated spread mechanism has complicated management efforts nationwide and prompted restrictions at managed cave systems.
The northern long-eared bat, which inhabits much of the United States and Canada, became the first bat species placed on the federal Endangered Species List specifically due to white-nose syndrome. This designation reflects the disease’s capacity to drive species toward extinction. Other bat species face similar population declines across their ranges, though formal endangered status has not been assigned.
Oregon currently has no state-listed endangered or threatened bat species, according to federal Fish and Wildlife Service records. However, the arrival of white-nose syndrome creates conditions that could lead to such listings in the future.
What’s Next
Oregon wildlife officials will establish baseline data on white-nose syndrome distribution across the state through continued monitoring and sampling of bat populations and hibernation sites. This surveillance effort will inform decisions about cave access restrictions and public education campaigns.
Managed cave systems in Oregon, including Oregon Caves National Monument and Preserve in southern Oregon, already prohibit visitors from bringing gear, clothing, or footwear that has been used in other caves. These protocols may be expanded or strengthened based on findings from ongoing monitoring.
Collaboration between state agencies, the federal government, and research institutions will continue as scientists work to understand transmission patterns specific to Oregon’s bat populations and cave systems. Future decisions regarding endangered species listings for Oregon bat populations may emerge if infection rates and population declines accelerate.