Leptospirosis is a disease that can be transmitted from animals to humans and is caused by bacteria called leptospires. Leptospires are capable of infecting most mammals, and rodents are a common reservoir. We would like to look for these bacteria in Alaskan rodents. Knowing the status of leptospirosis in Alaskan rodents will allow us to better understand the dynamics of this disease in the north, and to prepare for changes in the transmission of this disease that may occur with climate change.