False-colour transmission electron micrograph of a colony of the Gram-negative bacteria Legionella pneumophila, cause of Legionnaire's disease. The bacteria were identified as an agent of disease in 1976 after a mysterious outbreak of pneumonia and other respiratory illness at an American Legion convention in the USA. It was found living in water-tanks, shower-heads and in the cooling towers of air-conditioning systems. The disease is also known as legionellosis. Magnification: x9660 at 6x4.5cm size, x5270 at 35mm size.
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