The bacteria grow best in warm water, like the kind found in hot tubs, cooling towers, hot water tanks, large plumbing systems, or parts of the air-conditioning systems of large buildings. Indoor ornamental fountains have been confirmed as a cause of Legionnaires' disease outbreaks, in which submerged lighting as a heat source was attributed to the outbreak in all documented cases.[citation needed] Controlling the growth of Legionella in ornamental fountains is touched on in many of the listed guidelines. However, specific guidelines for ornamental fountains have also been published
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