Updated: Friday, August 2 2013, 09:18 PM EDT
It is more important than ever that sick children stay out of swimming pools this summer.
As News 13's Jay Siltzer reports in today's Health Alert, one mishap stands to put others at risk for longer than you might think.
"Cryptosporidium can live almost 11 days in water...in chlorinated water."
An intestinal parasite that strong, and sometimes deadly, has health officials sending out a warning to swimmers of all ages.
Sue Ellen Morrison, RN Buncombe Co. Disease Control, "people need to remember you should not be at a pool if you have diarrhea ...you or your children. You share the water and the germs in it with everyone in the pool."
Health officials say one of the biggest dangers at public pools is swimmers ingesting the water, and in the case of small children, then spitting it back out.
Teri Gentile, Aquatics Supervisor, "the state requires a one part per million free available chlorine....Buncombe County pools have a two parts per million available chlorine."
Sherry Fox, Leicester, "it's very clear. I've been here several times and I've never seen it dirty; the water has always been clear..."
Most pool problems, though, stem from running and falling before reaching the water.
Carissa Moore, RS, Environmental Health, "you want to look at those drains at the bottom of the pool and make sure the drains are there, not broken. Want to make sure your child doesn't play near the drains because there is suction on it."
That can lead to the worst case scenario, drowning.
Some safety experts tell us that county public pools are typically cleaner and safer than backyard pools, whether in-ground or above ground.