It is the policy of The Ohio State University (OSU) to take precautions to eliminate potential hazards in the workplace. The purpose of the Legionella Exposure Control Plan is to specify the standard practices to be used by facility management to prevent legionellosis associated with building water systems. Legionellosis refers to two illnesses associated with legionella bacterium. When the bacterium Legionella causes pneumonia, the disease is referred to as Legionnaires’ disease. Legionella can also cause a less severe influenza-like illness known as Pontiac Fever. Most all cases of legionellosis are the result of exposure to Legionella associated with building water systems.