The genus Naegleria consists of free-living amoebae widely distributed in soil and freshwater habitats throughout the world. These organisms characteristically undergo transformation from amoebae to flagellates. There are six species of Naegleria: N. fowtleri, N. aiustr(aliensis, N. lov,aniensis, N. griberi, N. jadini, and N. tliorntoni. Each species may be distinguished on the basis of cyst mo...