Chlorine disinfection of recreational water for Cryptosporidium parvum. Emerging Infectious Diseases | July 1, 1999| | COPYRIGHT 1999 U.S. National Center for Infectious Diseases. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright

We examined the effects of chlorine on oocyst viability, under the conditions of controlled pH and elevated calcium concentrations required for most community swimming pools. We found that fecal material may alter the Ct values (chlorine concentration in mg/L, multiplied by time in minutes) needed to disinfect swimming pools or other recreational water for Cryptosporidium parvum.

The small size of the Cryptosporidium parvum oocyst (4-6 um) and its resistance to many chemical disinfectants (e.g., chlorine) pose a challenge for standard filtration and disinfection ...

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