According to a CDC study released in October 2024, private hot tubs on cruise ships have been implicated in several outbreaks of Legionnaires' disease. Between November 2022 and June 2024, 12 cases were reported, with ten patients requiring hospitalization. Hot tubs, lacking stringent maintenance protocols, can facilitate the growth of Legionella bacteria. The CDC emphasizes the need for cruise operators to ensure proper cleaning and monitoring of these amenities to protect passengers' health, warning travelers to be cautious about their use.
Epidemiologic, environmental, and laboratory evidence suggests that private balcony hot tubs were the likely source of exposure in two outbreaks of Legionnaires disease among cruise ship passengers.
Hot tubs can be a source of Legionella growth and transmission when they are inadequately maintained and operated. It is important for cruise ship operators to inventory hot tub-style devices across their fleets.
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