This brain eating amoeba is typically found in warm bodies of fresh water, such as ponds, lakes, rivers, and hot springs. It is also found in soil, near warm-water discharges of industrial plants, and unchlorinated swimming pools. There is no evidence of this organism living in ocean water.
It can invade and attack the human nervous system. Although this occurs rarely, such an infection nearly always results in the death of the victim. The case death rate is estimated at 98%
This is yet another reminder of the importance of having a clean supply of water in your survival pack.
You can read more at
http://en.wikipedia.org/wiki/Naegleria_fowleri
or
http://news.blogs.cnn.com/2012/10/10/brain-eating-amoebas-kill-10-in-pakistan/