This is likely because swimming venues are using chlorine and bromine disinfectants, and maintaining the proper pool PH - measures "which are well documented to inactivate most infectious pathogens within minutes," the researchers said.īecause Cryptosporidium can't be killed by chlorine and water filters, "we're really asking swimmers to keep Cryptosporidium out of the water in the first place," Hlavsa told Live Science. While Cryptosporidium outbreaks have increased, researchers have also found that, in general, the diversity of infectious germs causing outbreaks in treated swimming areas has decreased. It could be about where they went swimming," Hlavsa said. But now, "people are realizing it's not necessarily only about where they ate or what they ate. When people get sick with diarrhea, they often think that something they ate caused the symptoms. One possibility is that there has been an increase in awareness about swimming-related illnesses, so people are reporting them more, said study co-author Michele Hlavsa, an epidemiologist with the CDC's Healthy Swimming program. Researchers don't know for sure why they're seeing an increase in Crypto outbreaks. Since 1988, when the very first Crypto outbreak tied to recreational water use was reported, the number of these outbreaks has increased, the researchers said.Ī report last year found that, from 2009 to 2010, Crypto caused 24 outbreaks in treated recreational water, compared with 36 outbreaks from 2011 to 2012.
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