A third of treated recreational waterborne disease outbreaks during 2000 through 2014 occurred in hotel pools or hot tubs, according to a report published today in CDC’s Morbidity and Mortality Weekly Report. Cryptosporidium (also known as “Crypto”), Pseudomonas, and Legionella caused most of the outbreaks in swimming venues in the United States during this time period. Crypto is a parasite tough enough to survive even in properly maintained pools. Pseudomonas and Legionella are bacteria that can survive disinfectants in slimy areas of hot tubs, pools, and water playgrounds.

The report describes mixed progress in preventing outbreaks caused by germs spread through treated recreational water. The 493 outbreaks reported during this period resulted in at least 27,219 illnesses and eight deaths. The number of respiratory disease outbreaks caused by Legionella increased over time and skin infection outbreaks caused by Pseudomonas decreased over time. Diarrheal disease outbreaks caused by Cryptosporidium leveled off during 2008 through 2014. More than half of outbreaks started in the summer, the peak season for swimming.

Common parasite remains the leading cause of illness from pools

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