Oh that disease due to a kind of Amoeba (Naegleria) is very bad because it actually almost always leads to death (post to meningo-encephalitis). 97-99% mortality unlike coccidioidomycosis (which is a little hyped in the article).
They tried Amphotericin B in some case with limited success but the disease is always fatal :(
http://en.wikipedia.org/wiki/Naegleria_fowleri
Personally, I prefer springs and oceans. So not too worried about that. Lakes around here are murky and full of gators any way.