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This 1983 microscope image provided by the Centers for Disease Control and Prevention shows Cryptosporidium parvum parasitic organisms in a stool smear specimen, the cause of a patient's cryptosporidiosis. On Thursday, May 17, 2018, the CDC said hotel pools and hot tubs are a major source of the diarrheal illnesses people get from swimming. The parasite can survive normal chlorine levels. (CDC via AP)

This 1983 microscope image provided by the Centers for Disease Control and Prevention shows Cryptosporidium parvum parasitic organisms in a stool smear specimen, the cause of a patient's cryptosporidiosis. On Thursday, May 17, 2018, the CDC said hotel pools and hot tubs are a major source of the diarrheal illnesses people get from swimming. The parasite can survive normal chlorine levels. (CDC via AP)

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