Bats in southeastern Arizona have tested positive for a fungus that poses a threat to the species, prompting wildlife officials to urge the public to report any potential infections.

A bat that was part of the cave myotis species in Fort Huachuca, just west of Sierra Vista, tested positive for a fungus known as Pseudogymnoascus destructans (Pd) that can cause deadly white-nose syndrome (WNS), according to the Arizona Department of Game and Fish.

The positive sample was collected during a June 2024 surveillance when Game and Fish identified a bat with abnormal wing features linked to the disease. The agency later discovered four additional bats, including two from other species, that tested positive for trace amounts of the fungus.

Debbie Brewer, a Game and Fish biologist for the Fort Huachuca area, said monitoring for the Pd has existed in the area since 2014, with positive infections found in 2017, followed by low-level spread in 2021 and 2023.

“Though not unexpected, our 2024 high-level positive detection in cave myotis is highly concerning and should put other land managers in the Southwest on alert that habitat protections for this and other species of bat are warranted,” wrote Brewer in a news release.

With the help of citizen scientists: An endangered bat species has been found in Arizona

White-nose syndrome

Pd, which causes white-nose syndrome, is named after the white fungal growth seen on infected bats. Since 2006, the disease has led to the deaths of millions of bats across 40 U.S. states and nine Canadian provinces, according to Game and Fish.

White-nose syndrome does not pose a risk to humans or pets, but human activity is a major concern for bringing fungal spores into cold, humid caves where bats hibernate, and where optimal growing conditions exist for the fungus.

“This disease did not exist when I first began working with bats. To see new threats to our bat populations like this is disturbing,” said Angie McIntire, a specialist on Arizona bats for Game and Fish.

A bat infected with WNS may display unusual behavior, which Game and Fish said usually appears like the bat is unable to fly or is perched low on a wall or is on the ground.

The wildlife agency asks the public to help monitor for the disease by reporting any possible cases by email to bats@azgfd.gov, sending a detailed report of the encounter, photos, location and contact information, but also reminds the public to never handle bats.

Game and Fish said since 2019, the fungus has been found in Mohave, Coconino, Yavapai and Cochise counties, and at Grand Canyon National Park. Between 2021 and 2024, a total of eight bats, including cave myotis, southwestern myotis and big brown bats, tested positive for the fungus.

Infections within the cave myotis bat species also have been found nearby in New Mexico and Texas, highlighting to researchers a possible vulnerability among the species for WNS.

Bat season in Arizona: What attracts them and are they dangerous?

Reach reporter Rey Covarrubias Jr. at rcovarrubias@gannett.com. Follow him on X, Threads and Bluesky @ReyCJrAZ.