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Legionella sp. bacterium, coloured transmission electron micrograph (TEM). This Gram-negative flagellated bacterium is the cause of legionellosis, or Legionnaires' disease. The bacterium is naturally found in water, and can inhabit reservoirs of water inside buildings, such as in air conditioning systems. It was one of these that led to the first recorded outbreak of the disease, at an American Legion convention in Philadelphia, USA, in 1976. It is from this outbreak that the bacterium takes its name. Infection causes pneumonia and fever, although prompt treatment with antibiotics can effect a complete cure. Magnification: x15,000 when printed 10cm wide.
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