Did you see where a young man from Ocean Springs just died from this? He had a cut, and got in the water and got the infection, but he had health issues. To me the key considerations include whether or not you have a compromised immune system, or liver problems, whether you have a cut which will allow the bacteria to enter, and also, the bacteria proliferates when the water is warmer. If you do not get treatment immediately, (< 72 hours) things quickly go from bad to worse. I always use Neosporin when I have a line cut or something as soon as I can. Some of the the symptoms you should watch out for are lethargy and flu like symptoms. If you get these after being on the water, be sure to get treatment, and tell your Dr. you might have been exposed. I am going to start using bleach per the advice given here.