Four things to know:
1. Cryptosporidium is a chlorine-tolerant parasite that causes a diarrheal disease known as cryptosporidiosis, according to U.S. News and World Report.
2. Between 2009 and 2017, the prevalence of cryptosporidiosis outbreaks has increased 13 percent annually.
3. The CDC has recorded 444 cryptosporidiosis outbreaks in 40 states and Puerto Rico over the same time period.
4. More than half of the 7,465 cases confirmed between 2009 and 2017 involved exposure to treated recreational water from pools or waterparks.
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