Phoenix city officials have announced that all city pools will be closed after reports of 35 people who swam at Starlight Pool, including 14 from the pool staff, developing symptoms of cryptosporidium.

The city of Phoenix says that while the water at all of its pools has been tested and "has continued to meet all water quality standards," it is taking extra precautions.  To treat the pools, parks staff is super-chlorinating all of the pools to a level of 40 parts per million of chlorine and maintaining that level of chlorine for 40 hours. The Centers for Disease Control recommends 20 parts per million, but the City of Phoenix is using 40 parts per million to be safe.

Last summer Utah suffered an outbreak of cryptosporidium.  Colorado has also suffered outbreaks.  Hopefully this summer’s outbreak will be quickly contained and taken care of to avoid large numbers of sickness.

And of course, when using the bathroom at the pool, always wash your hands.