Legionella pneumophila is a rod-shaped, Gram-negative, aerobic bacterium in the Legionellaceae family. Legionella pneumophila infections result in Legionnaires disease (pneumonia) or Pontiac fever (a short feverish form of Legionnaires disease). Transmission mainly occurs by inhaling aerosols containing legionellae (e.g. from hot water pipes and ventilation systems).
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