Legionella is a genus of pathogenic gram-negative bacteria that includes the species L. pneumophila, causing legionellosis including a pneumonia-type illness called Legionnaires' disease and a mild flu-like illness called Pontiac fever. Legionella may be visualized with a silver stain or cultured in cysteine-containing media such as buffered charcoal yeast extract agar. It is common in many environments, including soil and aquatic systems, with at least 50 species and 70 serogroups identified. These bacteria, however, are not transmissible from person to person; furthermore, most people exposed to the bacteria do not become ill. Most outbreaks are traced to poorly maintained cooling towers. The side chains of the cell wall carry the bases responsible for the somatic antigen specificity of these organisms.

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New Legionella Species Discovered in Italy

Legionellosis: A novel mechanism by which the bacterium Legionella pneumophila regulates the immune response of its host cells

Ancestors of legionella bacteria infected cells two billion years ago

Ancestors of Legionella Bacteria – Which Causes Legionnaires’ Disease – Infected Cells Two Billion Years Ago

How Legionella makes itself at home

How Legionella makes itself at home