It is a free living amoeba and can be found almost everywhere.It is resistant to chlorination of water.For immuno competant person it can cause acanthamoeba keratitis that will lead to blindness if it is not treated.Contact lense wearer usually is susceptible to this disease.In immunosuppressed person,it can cause granulomatous amoebic encephalitis. Treatment: 1.Acanthamoeba keratitis:PHMB and Brolene 2.GAE:5-fluorocytosine #easyparasites