Learn more about legionella bacteria Among Legionella species, Legionella pneumophila has the highest pathogenicity in humans. This bacterium causes Legionnaire’s disease (legionellosis[1]). Legionnaires’ disease is a severe type of pneumonia that can be fatal if left untreated. There is also a milder form of the disease called Pontiac fever, which resembles the flu. Changes caused by Legionella bacteria occur when contaminated water is inhaled (in the form of an aerosol) and enters the lungs. For example, when showering or through the air conditioning system. Indications to combat legionella Before going to the methods of diagnosis and identification of legionella, it is better to point out …