The best-known legionellosis is a severe atypical CAP referred to as Legionnaire’s Disease (LD)12. The first report of LD was among attendees of the bicentennial celebration of the American Legion Auxiliary2 in 1976, where transmission occurred via the hotel air conditioning system. Another, lesser known, legionellosis is Pontiac Fever3 characterized by mild flu-like symptoms without pneumonia. Because legionellae inhabit freshwater ecosystems, they are often found in man-made water systems such as showers, spas, hospital heating systems, cooling towers, ventilation and air conditioning units, and decorative water fountains, which are the usual sources for aerosolization of the organism and subsequent clinical outbreaks. In addition, legionellae are able to form biofilms, and survive and replicate in the soil and within amoeba, which can shield them from environmental disinfectants, creating an even larger public health threat45.