Centers for Disease Control and Prevention. Legionella (Legionnaires' disease and Pontiac fever): causes, how it spreads, and people at increased risk. Last reviewed Jan 2020; accessed Feb 2020.
Centers for Disease Control and Prevention. Legionella (Legionnaires' disease and Pontiac fever): causes, how it spreads, and people at increased risk. Last reviewed Jan 2020; accessed Feb 2020.