Oregon State University confirmed the silver-haired bat had rabies after the victim captured it near Breitenbush. The unincorporated area encompasses the Willamette National Forest and includes hot springs.
"Our recommendation is they should not touch or handle bats. Particularly if they're out during daylight hours or on the ground, they're probably sick," an official with the Marion County Health Department, said.
The tourist was able to capture the bat. Officials recommend attempting to capture bats for testing if bitten.
The bat was the fourth to test positive for rabies in the state this year.
Rabies symptoms include irritability, aggressiveness, confusion, weakness and nausea.
The Associated Press contributed to this report.