Legionella Pneumophila Legionella pneumophila is a disease-causing microorganism, which is ubiquitous in water systems and can infect people, being particularly dangerous for hospital patients that have a compromised immune system. This microorganism is well known for causing Legionellosis (Legionnaires’ disease and Pontiac fever). L. pneumophila and other species of the genus Legionella thrives in temperatures between 20 […]