Article: Pool parasites survive chlorine

Rising infections from a chlorine-resistant parasite called Cryptosporidium are forcing pools and water parks across the country to take new measures - from ultraviolet-light water treatments to tighter swimming restrictions - to keep their water clean.

The parasite - commonly called crypto - is found in human and animal feces and is easily transmitted through water. When ingested, crypto can cause an illness of up to two weeks, with symptoms that include long bouts of diarrhea, abdominal cramps, nausea, vomiting, headaches and low-grade fevers.

Crypto outbreaks have been increasing over the past two decades, according to Michael Beach, associate director for healthy water at the National ...

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