Which Diseases Are Most Commonly Spread In Swimming Pools?

The most frequently reported illness are caused by germs such as Cryptosporidium (crypto), Giardia, E. coli O157:H7 (E. coli), and Shigella. Some of these outbreaks may affect thousands of swimmers.

Crypto is the major germ that causes outbreaks in swimming pools and spas, where its extreme chlorine resistance and small size make it a difficult problem for even the best equipped and well-maintained pools.

Major outbreaks in connection with Giardia occurred in systems that do not use or have a defect in the filtration system of pools.

E. coli and Shigella are relatively sensitive to chlorine or bromine so most outbreaks have occurred in locations where no disinfectant are added.


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