Another reason to avoid public pools, from CNN:

The most common recreational water illness is spread through diarrhea. One of the most persistent problems is Cryptosporidium, a parasite that causes diarrhea and can be found in infected stools. “With Crypto, if you have diarrhea, it’s very watery,” she said. “It’s not a formed stool sitting in the pool or floating on top. It could be very watery, and no one [in a pool] would know.” Unlike E. coli and salmonella, Crypto can resist chlorine.

Also, did you know CNN’s preferred term for butt is “bottom”?